计算:(1)-3ab(2a2b+ab-1)(2)(x-y)(2x+y).
题型:解答题难度:一般来源:不详
计算: (1)-3ab(2a2b+ab-1) (2)(x-y)(2x+y). |
答案
(1)原式=-6a3b2-3a2b2+3ab;
(2)原式=2x2+xy-2xy-y2 =2x2-xy-y2. |
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