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(5x+2)(x-2) -5(x+1)(x-3)怎么做
人气:152 ℃ 时间:2020-06-22 07:41:28
解答
(5x+2)(x-2) -5(x+1)(x-3)
=5x²+2x-10x-4-5(x²+x-3x-3)
=5x²-8x-4-5x²+10x+15
=2x+11
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