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f(x,y)=(xy)/(x^2+y^2)求f(xy,x/y)

题目详情
f(x,y)=(xy)/(x^2+y^2)求f(xy,x/y)
▼优质解答
答案和解析
f(xy,x/y)=x²/(x²y²+x²/y²)
=x²y²/[x²+(xy²)²] =y²/(1+y^4)
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