IUV

Verified answer

(y+x)^(1/4)=k
(x-у)^(1/4)=n
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k+n=4
k^2-n^2=(k+n)(k-n)=8
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k+n=4
k-n=2
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k=3=(y+x)^(1/4)
n=1=(x-у)^(1/4)
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y+x=81
x-у=1
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x=41
у=40