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数学
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(x+2)(x^2-x-1)+(-x+3)(x-1)化简
人气:458 ℃ 时间:2020-05-14 10:46:42
解答
(x+2)(x^2-x-1)+(-x+3)(x-1)
=x³-x²-x+2x²-2x-2+(-x²+x+3x-3)
=x³+x²-3x-2-x²+4x-3
=x³+x-5
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