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数学
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当x=3,y=4,x的-2方+y的-2方=
人气:253 ℃ 时间:2020-06-13 21:23:44
解答
解
x^(-2)+y^(-2)
=1/x²+1/y²
=1/3²+1/4²
=1/9+1/16
=(25)/144
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