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已知:x2+y2=4xy,求(x4+y4)÷(xy)2
人气:194 ℃ 时间:2020-06-21 19:40:07
解答
(x⁴+y⁴)÷(xy)²=[(x²+y²)²-2x²y²]/(x²y²)=[(4xy)²-2x²y²]/(x²y²)=(16x²y²-2x²y²)/(x²y²)=14x²y...
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