x+y=24 xy=?
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|x|/x+y/|y|+xy/|xy|=
x+y=24 xy=?
证明|xy|=|x||y|
xy-(x+y)=1000
证明|xy|=|x||y|
计算：( 根号xy-xy/x+根号xy)÷根号xy-y/x-y=
化简:(x+y-4xy/x+y)*(x-y-4xy/x-y)=
y'-xy=x/y通解
xy=y'ln(y'/x)
sin(xy)=x 求dx/dysec(xy)-y ]/x 还是 x/[sec(xy)-y]
（-3x^y+2xy)-( )=4x^+xy
（xy-x的平方）*x-y分之xy=
(xy-x平方)乘以x-y份之xy=?
(XY-X^2)除以X-Y/XY=?
1/x-1/y=x,求5y+xy-5y/y-xy-x=?
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?
x+y=24,(x+3y)24=8xy,解x.y
已知X+y=10,XY=24,求(X-Y)(X-Y)的值