已知x2+2x-1=0.求代数式2x4+1/x4+2x3+2x2+3x-6的值
已知x2+2x-1=0.求代数式2x4+1/x4+2x3+2x2+3x-6的值
数学人气：603 ℃时间：2020-04-04 20:16:16
优质解答
由x2+2x-1=0.得（X-1）²=0.所以X=1,那么2x4+1/x4+2x3+2x2+3x-6=2+1+2+2+3-6=4
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