题目内容
【题目】化简:
(1)3x2y-5xy2+3xy2+7x2y-2xy
(2)7ab-3(a2-2ab)-5(4ab-a2)
【答案】(1)10x2y-2xy2-2xy;(2)-7ab+2a2.
【解析】
(1)直接合并同类项即可;
(2)先去括号,再合并同类项即可.
(1)3x2y-5xy2+3xy2+7x2y-2xy
=10x2y-2xy2-2xy;
(2)7ab-3(a2-2ab)-5(4ab-a2)
=7ab-3a2+6ab-20ab+5a2
=-7ab+2a2.
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