《2019年秋北师大版深圳专用数学七年级上册同步分层训练第三章整式及其加减4整式的加减第2课时去括号含答案.pdf》由会员分享，可在线阅读，更多相关《2019年秋北师大版深圳专用数学七年级上册同步分层训练第三章整式及其加减4整式的加减第2课时去括号含答案.pdf（5页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、4第 2 课时去括号知识点1去括号法则1去括号的依据是()A乘法交换律B乘法结合律C乘法对加法的分配律D乘法交换律与乘法对加法的分配律2下列运算正确的是()Aa(bc)abc Ba(bc)abc Ca(bc)ab c Da(bc)abc 3教材随堂练习第2 题变式下列各式一定成立的是()A2a(3bc)2a3bc B3a2(2b1)3a4b1 Ca2b3ca(2b3c)Dmnab m(nab)第 1 页，共 5 页4去括号并合并同类项：2a(5a3)_5去括号：2(4a5b)(3c z)_6化简：(1)x(xy)；(2)4(ab)3(2ab)知识点2去括号法则的应用7若长方形的一边长为3x2y
2、，与其相邻的另一边长为xy，则它的周长为 _8王冬梅用3 天看完了一本书，第一天看了x 页，第二天比第一天多看50 页，第三天比第二天少看85 页，用含 x 的代数式表示这本书的总页数为_，当 x100 时，这本书的总页数是_9已知 ab 2，c d3，则(bc)(ad)的值是()A1B 5C1D5 10有理数 a，b，c 在数轴上对应点的位置如图342 所示，则|ba|bc|ac|的化简结果为()图 342 A0 B2a C2b D2b 2c 11在计算 A(5x23x 6)时，小明同学将括号前面的“”号抄成了“”号，得到的运算结果是2x23x4，则多项式A 是_第 2 页，共 5 页文档编
3、码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8
4、 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10
5、 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文
6、档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1
7、G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U
8、10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S
9、2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S212先化简，再求值：(1)5x3x2(2x2x21)，其中 x 5；(2)6a2a2(5a22a)2(a23a)，其中 a 8.13已知 AB3x2x，BCx2，求 AC.第 3 页，共 5 页文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V
10、8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4
11、Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q
12、6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X
13、2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2
14、H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C
15、1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U
16、1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2详解详析1C2.D 3C解析 A2a(3bc)2a 3bc，故本选项错误；B.3a2(2b1)3a4b2，故本选项错误；C.a2b3c a(2b3c)，故本选项正确；D.mn abm(nab)，故本选项错误43a3解析 2a(5a 3)2a5a3 3a3.58a 10b3cz解析 根据去括号的方法可知：2(4a5b)(3c z)8a10b
17、3cz.故答案是：8a 10b3c z.6解：(1)原式 xx y2xy.(2)原式 4a4b6a3b 2a7b.78x2y解析 长方形的周长等于两邻边的和的2 倍，即 2(3x2y)(xy)6x4y2x 2y8x2y.83x15315 解析 x(x50)(x5085)3x15.9A解析 因为 ab2，cd3，所以(bc)(ad)bc ad(ab)(cd)(2)3 1.10C解析 由数轴上点的位置得ab0c，|b|c|a|，所以 b a0，bc0，ac 0，则|ba|bc|ac|ba(bc)(ca)babc ca2b.117x26x2解析 根据题意得A(2x23x4)(5x23x6)2x23x
18、45x23x6 7x26x2.故答案为 7x26x2.12解析 (1)先把代数式去括号、合并同类项化简后，再代入求值(2)此题去括号时，可以先去小括号，再去中括号；也可以先去中括号，再去小括号解：(1)5x3x2(2x 2x21)5x3x22x 2x21 第 4 页，共 5 页文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V
19、8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4
20、Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q
21、6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X
22、2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2
23、H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C
24、1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U
25、1X2V8S2 5x23x1.当 x 5时，原式 5(5)23(5)1111.(2)6a2a2(5a22a)2(a23a)6a2(a25a22a2a26a)6a2a25a22a2a26a 2a24a.当 a 8 时，原式 2(8)24(8)12832160.13解析 由 AB，BC，不能分别求出A，B，C，故只能把 AB，BC 都看作整体，会发现用 AB 减 BC，正好得 AC.解：A C(AB)(BC)(3x2x)x2 3x2xx22x2x.第 5 页，共 5 页文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6
26、Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2
27、V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H
28、4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1
29、Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1
30、X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC
31、2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2文档编码:CC2H4Z7X1G8 HJ4C1Q6Z9U10 ZL7U1X2V8S2