2018年秋七年级数学上册第二章整式的加减第5课时整式的加减(2)(作业本)课件(新版)新人教版.ppt

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作 业 本,第5课时 整式的加减(2),第二章 整式的加减,作 业 本,一、选择或填空题(每题10分,共40分) 1化简2(mn)的结果为( ) A2mn B2m+n C2m2n D2m+2n 2下列去括号正确的是( ) A(a+bc)=a+bc B2(a+b3c)=2a2b+6c C(abc)=a+b+c D(abc)=a+bc,D,B,作 业 本,3化简:2( xy)=_4去括号并合并同类项:2a(5a3)=_,-x+2y,3a+3,作 业 本,二、解答题(每题60分,共60分) 5去括号并合并同类项:,解:(1)15 (2) x4 (3)2a26ab,作 业 本,(4)2x2+7xy24 (5)x2,

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