计算:
(1)5a2-2ab+4b2+ab-2a2-7ab-4b2;
(2)-3(x+2y)-4(3 x-4y)+2(x-5y);
(3)2(2a2b-ab2)-[3(a2b-4ab2)-(ab2-a2b)].
(1)5a2-2ab+4b2+ab-2a2-7ab-4b2;
(2)-3(x+2y)-4(3 x-4y)+2(x-5y);
(3)2(2a2b-ab2)-[3(a2b-4ab2)-(ab2-a2b)].
19-20七年级上·江苏·期中 查看更多[2]
更新时间:2020-11-22 14:34:52
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