题型:单选题
难度:0.64
引用次数:373
题号:2863789
下列计算正确的是( )
A.2a3+a2=3a5 | B.(3a)2=6a2 |
C.(a+b)2=a2+b2 | D.2a2•a3=2a5 |
更新时间:2015-03-02 17:23:57
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【知识点】 初中数学综合库
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