化简(1)(-2ab+3a)-2(2a-b)+2ab(2)2a2-[3a-(5a-2)+2a2].
题型:解答题难度:一般来源:不详
化简 (1)(-2ab+3a)-2(2a-b)+2ab (2)2a2-[3a-(5a-2)+2a2]. |
答案
(1)原式=-2ab+3a-4a+2b+2ab=-a+2b; (2)原式=2a2-[3a-5a+2+2a2]=2a2-3a+5a-2-2a2=2a-2. |
举一反三
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5x-(3x-2y)-3(x+y),其中x=-2,y=1. |
化简5(2x-3)+4(3-2x)结果为( )A.2x-3 | B.2x+9 | C.8x-3 | D.18x-3 |
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