合并同类项(1)3a2+2a-2-a2-5a+7(2)2(x2y+xy)-4(2x2y2-12y2x2)-(5xy+6x2y).
题型:解答题难度:一般来源:不详
合并同类项 (1)3a2+2a-2-a2-5a+7 (2)2(x2y+xy)-4(2x2y2-y2x2)-(5xy+6x2y). |
答案
(1)原式=2a2-3a+5; (2)原式=2x2y+2xy-8x2y2+2x2y2-5xy-6x2y=-6x2y2-4x2y-3xy. |
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