题目内容
合并同类项
(1)3a2b+2ab2-5-3a2b-5ab2+2
(2)x+(5x+2y)-(x-2y)
(3)a-2(2a+b)+3(a-b)
(4)16+a-{8a-[a-9-(3-6a)]}.
(1)3a2b+2ab2-5-3a2b-5ab2+2
(2)x+(5x+2y)-(x-2y)
(3)a-2(2a+b)+3(a-b)
(4)16+a-{8a-[a-9-(3-6a)]}.
(1)原式=(3-3)a2b+(2-5)ab2-5+2=-3ab2-3;
(2)原式=x+5x-x+2y+2y=5x+4y;
(3)原式=a-4a+3a-(2b+3b)=-5b;
(4)原式=16+a-8a+a-9-3+6a=4.
(2)原式=x+5x-x+2y+2y=5x+4y;
(3)原式=a-4a+3a-(2b+3b)=-5b;
(4)原式=16+a-8a+a-9-3+6a=4.
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