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数学
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已知x的n次方=5,y的n次方=2,求(xy)的3n的值.
RT
人气:342 ℃ 时间:2019-08-19 04:23:13
解答
x^n=5
y^n=2
(xy)^3n
=[(x^n)*(y^n)[^3
=[5x2]^3
=10^3
=1000
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