已知X^2-11X+1=0 求x^2 + 1/x^2
人气:235 ℃ 时间:2020-05-27 11:32:05
解答
X^2-11X+1=0
x-11+1/x=0
x+1/x=11
x^2+1/x^2=(x+1/x)^2-2=11^2-2=119
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