Question

xy=2 x+y=-9 求√(y\x)+√(x\y)的值

Answer 1

原式²=y/x+x/y

=(x²+y²)/xy

=(x²+y²)/2

=[(x+y)²-2xy]/2

=(81-4)/2

=77/2

所以，原式=(√154)/2

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