如果x+1x=2,则x2x4+x2+1=______.-数学

题目简介

如果x+1x=2,则x2x4+x2+1=______.-数学

题目详情

如果x+
1
x
=2,则
x2
x4+x2+1
=______.
题型:填空题难度:中档来源:不详

答案

∵(x+class="stub"1
x
)2=x2+2+class="stub"1
x2
=4,
∴x2+class="stub"1
x2
=2,
x2
x4+x2+1
=class="stub"1
x2+1+class="stub"1
x2
=class="stub"1
3

故本题答案为:class="stub"1
3

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