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1、20XX年中考数学知识点基础测试题2 二次根式（一）判断题：（每小题1 分，共 5 分）12)2(2（）221x是二次根式（）32212132212131312 1（）4a，2ab，ac1是同类二次根式（）5ba的有理化因式为ba（）【答案】1；2；3；4；5（二）填空题：（每小题2 分，共 20 分）6等式2)1(x1x成立的条件是_【答案】x17当x_时，二次根式32x有意义【提示】二次根式a有意义的条件是什么？a0【答案】238比较大小：3 2_23【提示】243，023，032【答案】9计算：22)21()213(等于 _【提示】(321)2(21)2？【答案】2310计算：92131
2、3114a_【答案】92aa11 实数a、b在数轴上对应点的位置如图所示：a o b 则3a2)43(ba_【提示】从数轴上看出a、b是什么数？a0，b03a4b是正数还是负数？3a4b0【答案】6a4b12若8x2y0，则x_，y _【提示】8x和2y各表示什么？x 8 和y2 的算术平方根，算术平方根一定非负，你能得到什么结论？x8 0，y20【答案】8，213325的有理化因式是_【提示】（325）（325）11【答案】32514当21x 1 时，122xx241xx_【提示】x2 2x1（）2；41xx2（）2x1；21x 当21x1 时，x1 与21x各是正数还是负数？x 1 是负数
3、，21x也是负数 文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y
4、3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编
5、码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J
6、4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W
7、3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J
8、8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W
9、6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4【答案】232x15若最简二次根式132ba与ab4是同类二次根式，则a_，b_【提示】二次根式的根指数是多少？3b12 a2 与 4ba有什么关系时
10、，两式是同类二次根式？a24ba【答案】1，1（三）选择题：（每小题3 分，共 15 分）16下列变形中，正确的是（）（A）(23)2236 （B）2)52(52（C）169169（D）)4()9(49【答案】D【点评】本题考查二次根式的性质注意（B）不正确是因为2)52(|52|52；（C）不正确是因为没有公式baba17下列各式中，一定成立的是（）（A）2)(baab （B）22)1(aa21（C）12a1a1a（D）bab1ab【答案】B【点评】本题考查二次根式的性质成立的条件（A）不正确是因为ab不一定非负，（C）要成立必须a 1，（D）要成立必须a0，b018若式子12xx21 1
11、有意义，则x的取值范围是（）文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y1
12、0I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3
13、B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码
14、:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4
15、M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3
16、 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8
17、N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4（A）x21（B）x21（C）x21（D）以上都不对【提示】要使式子有意义，必须.021012xx【答案】C19当a0，b0 时，把ba化为
18、最简二次根式，得（）（A）abb1（B）abb1（C）abb1（D）abb【提示】ba2bab|bab【答案】B【点评】本题考查性质2a|a|和分母有理化注意（A）错误的原因是运用性质时没有考虑数20当a0 时，化简|2a2a|的结果是（）（A）a（B）a（C）3a（D）3a【提示】先化简2a，a0，2aa再化简|2a2a|3a|【答案】D（四）在实数范围内因式分解：（每小题4 分，共 8分）212x24；【提示】先提取2，再用平方差公式【答案】2（x2）（x2）22x42x23【提示】先将x2看成整体，利用x2pxq（xa）（xb）其中abp，abq分解再用平方差公式分解x23文档编码:CM
19、2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M
20、6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD
21、9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X
22、4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW
23、9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I1
24、0Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文
25、档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4【答案】（x21）（x3）（x3）（五）计算：（每小题5 分，共 20 分）23（48814）（3135.02）；【提示】先分别把每一个二次根式化成最简二次根式，再合并同类二次根式【
26、答案】3324（5481276）3；【解】原式（2032376）31203312331763120276332222125501224212(21)0；【解】原式52 2(21)42221 52 222222 5226（ba3ba 2abab）ab【提示】本题先将除法转化为乘法，用分配律乘开后，再化简【解】原式（ba3ba2abab）baba3bababa 2abbaabba文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W
27、6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y
28、10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y
29、3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编
30、码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J
31、4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W
32、3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J
33、8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4a2)(ba22aa2aba2【点评】本题如果先将括号内各项化简，利用分配律乘开后还要化简，比较繁琐（六）求值：（每小题6 分，共 18 分）27已知a21，b41，求babbab的值【提示】先将二次根式化简，再代入求值【解】原式)()()(babababbabbababbabbab2当a21，b41时，原式41214122【点评】如果直接把a、b的值代入计算，那么运算过程较复杂，且易出
34、现计算错误28已知x251，求x2x5的值【提示】本题应先将x化简后，再代入求值【解】x251452525x2x5(52)2(5 2)5 545 45 25745【点评】若能注意到x 25，从而(x2)2 5，我们也可将x2x5化成关于x2的二次三项式，得如下解法：x2x5(x2)23（x2）25(5)23525 745文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M
35、6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD
36、9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X
37、4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW
38、9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I1
39、0Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文
40、档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM
41、2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4显然运算便捷，但对式的恒等变形要求甚高29已知yx2823yx 0，求(xy)x的值【提示】yx2，823yx都是算术平方根，因此，它们都是非负数，两个非负数的和等于0 有什么结论？【解】yx2 0，823yx0，而yx2823yx0，.082302yxyx解得.12yx(xy)x(2 1)29（七）解答题：30（7 分）已知直角三角形斜边长为（263）cm，一直角边长为（623）cm，求这个直角三角形的面积【提示】本题求直角三角形的面积只需
42、求什么？另一条直角边 如何求？利用勾股定理 【解】在直角三角形中，根据勾股定理：另一条直角边长为：22)326()362(3（cm）直角三角形的面积为：S213（326）23336（cm2）答：这个直角三角形的面积为（23336）cm231（7 分）已知|1 x|1682xx2x5，求x的取值范围【提示】由已知得|1 x|x4|2x 5此式在何时成立？1 x0 且x40【解】由已知，等式的左边|1 x|2)4(x|1 x|x4 右边 2x5文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I
43、10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4
44、文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:C
45、M2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4
46、M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 H
47、D9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3
48、X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 Z
49、W9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4只有|1 x|x1，|x4|4x时，左边右边这时.0401xx解得 1x4x的取值范围是1x4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW
50、9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I10Y3B4文档编码:CM2J4M4M6W3 HD9J8N3X4W6 ZW9Y10I1