XY=6,X+Y=18,X/Y=?
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|x|/x+y/|y|+xy/|xy|=
XY=6,X+Y=18,X/Y=?
x y属于R 2^x=18^y=6^xy则x+y
化简:(x+y-4xy/x+y)*(x-y-4xy/x-y)=
2x^+xy-y^-4x+5y-6=?
证明|xy|=|x||y|
xy-(x+y)=1000
证明|xy|=|x||y|
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y'-xy=x/y通解
xy=y'ln(y'/x)
解方程x*x+xy=y+y*y
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