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(1)3x-2y-(9x-7y)+2(4x-5y)
(2)(5a2+2a-1)-4(3-8a+2a2)
人气:204 ℃ 时间:2019-08-21 06:18:01
解答
(1)原式=3x-2y-9x+7y+8x-10y
=2x-5y;
(2)原式=5a2+2a-1-12+32a-8a2
=-3a2+34a-13.
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