x+1/x=a,
x^2+1/x^2
=(x^2+2+1/x^2)-2
=（x+1/x）^2-2
=a^2-2
x+x的负一次方=a求X的二次方+X的负二次方的值.
x+x的负一次方=a求X的二次方+X的负二次方的值.
很着急..
很着急..
数学人气：919 ℃时间：2020-03-29 21:40:50
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