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(x-1)(x²+2x-3)=
人气:423 ℃ 时间:2020-02-02 23:45:21
解答

(x-1)(x²+2x-3)
=x(x²+2x-3)-(x²+2x-3)
=x³+(2x²-x²)+(-3x-2x)+3
=x³+x²-5x+3
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