问题
解答题
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.
化简
(1)(-2ab+3a)-2(2a-b)+2ab
(2)2a2-[3a-(5a-2)+2a2].
(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.