已知多项式(2k-3)x+2x^2-3k的值于k无关,求多项x^2+x-1的值
人气：469 ℃ 时间：2019-12-22 22:05:56
解答
(2k-3)x+2x^2-3k
=k（2x-3)-3x+2x^2
值与k无关,则2x-3=0,x=3/2
x^2+x-1
=9/4+3/2-1
=11/4
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