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1、新初三数学试卷1.32的绝对值是()A32B32C8D82.若分式1263xx的值为 0，则()A2xB2xC21xD21x3.如图，ABC是等边三角形，点 D 在 AC 边上，35DBC，则ADBC的度数为()A25B60C85D954.下列计算正确的是()A632aaaB236aaaC632)(aaD2)2)(2(2aaa5.小彤的奶奶步行去社区卫生院做理疗，从家走了15 分钟到达距离家900 米的社区卫生院，她用了 20 分钟做理疗，然后用10 分钟原路返回家中，那么小彤的奶奶离家的距离S（单位：米）与时间 t（单位：分）之间的函数关系图象大致是()6.已知一个等腰三角形两边长分别为5，
2、6，则它的周长为()A16B17C16或17D10或127.根据分式的基本性质，分式xx432可变形为()A432xxBxx432Cxx423D423xx8.已知1ba，则bba222的值为()A0B1C2D49.如图，BD 是ABC的角平分线，BCDE/，DE 交 AB 于 E，若BCAB，则下列结论中错误的是()AACBDBEDAACBCAD2DEDBE10.已知定点 M（1x，1y）、N（2x，2y）（21xx）在直线2xy上，若)()(2121yyxxt，则下列说明正确的是()txy是比例函数；1)1(xty是一次函数；txty)1(是一次函数；函数xtxy2中y随x的增大而减小；AB
3、CD11.9 的平方根是 _.12.分解因式：yxyyx22_.13.函数5xxy的自变量 x 的取值范围是 _.14.如图在中，ACAB，40A，AB 的垂直平分线 MN 交 AC 于 D，则DBC_度.15.如图，直线bkxy与坐标轴交于 A（3，0），B（0，5）两点，则不等式0bkx的解集为 _.16.观察下列式子：第 1个式子：222345；第 2 个式子：22251213第 3个式子：22272425；按照上述式子的规律，第5 个式子为22211(_)(_)；第 n个式子为 _(n 为正整数)17.计算：（1）10)31()2011(4；（2）)4)()2(2bababa.18.如
4、图，在34正方形网格中，阴影部分是由5 个小正方形组成的一个图形，请你用两种方法分别在下图方格内添涂 2 个小正方形，使这 7 个小正方形组成的图形是轴对称图形。19.先化简，再求值：xxxx24)11(22，其中1x.文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E
5、10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2
6、U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3
7、B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1
8、V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码
9、:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G1
10、0O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G1 HI9E10E4C2U8 ZD3B9A3N1V5文档编码:CU1G10O5X9G
11、1 HI9E10E4C2U8 ZD3B9A3N1V520.如图，ABC中，ACAB，AM 是 BC 边上的中线，点 N 在 AM 上，求证NCNB.21.如图，已知直线bxy21经过点 A（4，3），与 y 轴交于点 B。(1)求 B 点坐标；(2)若点 C 是 x 轴上一动点，当BCAC的值最小时，求 C 点坐标.22.如图，在四边形 ABCD 中，90B，ABDE/，DE 交 BC 于 E，交 AC 于 F，BCDE，30ACBCDE。文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4
12、E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 H
13、E4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4
14、E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 H
15、E4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4
16、E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 H
17、E4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4
18、E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8(1)求证：FCD是等腰三角形；(2)若4AB，求 CD 的长。23.小丽想用一块面积为2400cm的正方形纸片，沿着边的方向裁出一块面积为2300cm的长方形纸片，使它长宽之比为2:3，请你说明小丽能否用这块纸片裁出符合要求的长方形纸片。24.如图，AD 是ABC的角平分线，H，G 分别在 AC，AB 上，且BDHD.(1)求证：B与AHD互补；(2)若1802DGAB，请探究线段 AG 与线段 AH、HD 之间满足的等量关系，并加以证明。文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N
19、8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S
20、4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N
21、8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S
22、4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N
23、8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S
24、4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N
25、8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E825.设关于x一次函数11bxay与22bxay，我们称函数)()(2211bxanbxamy（其中1nm）为这两个函数的生成函数。(1)请你任意写出一个1xy与13xy的生成函数的解析式；(2)当cx时，求cxy与cxy3的生成函数的函数值；(3)若函数11bxay与22bxay的图象的交点为 P（a，5），当12211baba时，求代数式namabaanbaam22)()(2222221221的值.26.已知 A（1，0）
26、，B（0，3），点 C 与点 A 关于坐标原点对称，经过点C 的直线与 y 轴交于点 D，与直线 AB 交于点 E，且 E 点在第二象限。(1)求直线 AB 的解析式；(2)若点 D（0，1），过点 B 作CDBF于 F，连接 BC，求DBF的度数及BCE的面积；(3)若点 G（G 不与 C 重合）是动直线 CD 上一点，且BABG，试探究ABG与ACE之间满足的等量关系，并加以证明。文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7
27、M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:C
28、G5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7
29、M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:C
30、G5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7
31、M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:C
32、G5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7
33、M7 ZH5T5N8J4E8数学参考答案与评分标准2011.1一、选择题（本题共30 分，每小题3 分）1.A 2B 3.D 4 C 5D 6C 7.A 8B 9C 10B 二、填空题（本题共18 分，每小题3 分）11.3 12.y(x-1)2 13.x -5 14.30 153x16.61,60(1 分);(2n2+2n+1)2-(2n2+2n)2=(2n+1)2(2 分)三、解答题（本题共52 分；第 17 题 8 分；第 18 题第 21 题各 4 分；第 22 题第 24 题各 5 分;第 25 题 6 分;第 26 题 7 分）说明：解法不同于参考答案,正确者可参照评分标准相应给分
34、.03123120114(1):17.10）（解(2)(2a-b)2+(a+b)(4a-b)=4a2-4ab+b2+4a2-ab+4ab-b2 3分=8a2-ab.4 分18.答案不唯一，参见下图.正确画出一个图给2 分;累计 4 分.221419.121(2)(2)(2)1.2:xxxxxx xxxxxx解当1x时,原式=.3221)1(121xx20.证明:AB=AC,AM 是 BC 边上的中线,AMBC.2分 AM 垂直平分BC.点 N 在 AM 上，NB=NC.4分21.解：(1)由点 A(4,3)在直线bxy21上,得CA-3-2-2-1-1325432BAOyx3 分4 分4 分3
35、 分2 分NMABC文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7
36、K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 Z
37、H5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7
38、K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 Z
39、H5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7
40、K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 Z
41、H5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8.4213bb=1.B(0,1).1分(2)如图,作点 A(4,3)关于 x 轴的对称点A(4,-3),连接 BA 交 x轴于点 C,则此时 AC+BC 取得最小值.2分设直线 BA 的解析式为1kxy,依题意-3=4k+1.k=-1.直线 BA 的解析式为1xy.3分令 y=0,则 x=1.C(1,0).4分22 解:(1)证明：DE/
42、AB,B=90，DEC=90.DCE=90-CDE=60.DCF=DCE-ACB=30.CDE=DCF.1分 DF=CF.FCD 是等腰三角形.2分(2)解:在 ACB 和 CDE 中,30,90CDEACBDEBCDECB ACB CDE.AC=CD.4分在 RtABC 中,B=90,ACB=30，AB=4,AC=2AB=8.CD=8.5分23.解：设长方形纸片的长为3x(x0)cm，则宽为2x cm，依题意得3x 2x=300.2分6x2=300.x2=50.x0，x=50.3分FEDCBA文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7
43、K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 Z
44、H5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7
45、K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 Z
46、H5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7
47、K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 Z
48、H5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7
49、K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8文档编码:CG5Z7K3U1S4 HE4T5R3P7M7 ZH5T5N8J4E8 长方形纸片的长为350 cm.5049,507.350 21,即长方形纸片的长大于20cm.4分由正方形纸片的面积为400 cm2,可知其边长为20cm,长方形的纸片长大于正方形纸片的边长.答:小丽不能用这块纸片裁出符合要求的长方形纸片.5分24.解:（1）证明：在AB 上取一点M,使得 AM=AH,连接 DM.CAD=BAD,AD=AD,AHD AMD.1分 HD=MD,AHD=AMD.HD=DB,DB=MD.DMB=B.2分 AMD+DMB =180
50、,AHD+B=180.3分即 B 与 AHD 互补.（2）由（1）AHD=AMD,HD=MD,AHD+B=180.B+2DGA=180,AHD=2DGA.AMD=2DGM.AMD=DGM+GDM.2DGM=DGM+GDM.DGM=GDM.4分 MD=MG.HD=MG.AG=AM+MG,AG=AH+HD.5分25.解：（1）答案不唯一.比如取 m=2 时，n=-1.生成函数为y=2(x+1)-(3x-1)=-x+3，即 y=-x+3.1分（2）当 x=c 时，y=m(x+c)+n(3x-c)=2c(m+n).2分1nm,y=2c(m+n)=2c.3分MGHDCBA文档编码:CG5Z7K3U1S4