(5x+7)(2x-3)-(10x+1)(x-2)怎么做?
人气:163 ℃ 时间:2020-02-03 21:36:32
解答
(5x+7)(2x-3)-(10x+1)(x-2)
=10x²-x-21-(10x²-19x-2)
=10x²-x-21-10x²+19x+2
=18x-19
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