已知3x*x-x=1,求6x*x*x+7x*x-5x+2000
人气：147 ℃ 时间：2019-12-08 23:42:38
解答
3x*x=1+x 得6x*x*x+7x*x-5x+2000=3x^2*2x+7x^2-5x+2000=(1+x)2x+7x^2-5x+2000=
9x^2-3x+2000=3(3x^2-x)+2000=3*1+2000=2003
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