x+x+y+y+y+y=80 x+x+y+y=40 问XY=?
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x+x+y+y+y+y=80x+x+y+y=40问XY=?x+x+y+y+y+y=80x+x+y+y=40问XY=?x+x+y+y+y+y=80x+x+y+y=40问XY=?2X+4Y=802X+2Y
x+x+y+y+y+y=80 x+x+y+y=40 问XY=?
x+x+y+y+y+y=80 x+x+y+y=40 问XY=?
x+x+y+y+y+y=80 x+x+y+y=40 问XY=?
2X+4Y=80
2X+2Y=40那么可得X=0 Y=20所以XY=0
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
{(x,y) |x|+|y|
x>y?x:y
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x^/y-x-y^/y-x化简.
化简x(y-x)-y(x-y)
行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y |
y/(x+y)-x/(x-y)
y=x(x
x+x+x+x+y+y+y=56
X*Y,当Y
x y x+yy x+y xx+y x y
(3x-y)(3y+x)-(x-y)(x+y)
化简x/y(x+y)-y/x(x+y)
化简:(x+ y)(x-y) +(x+ y) +(x-y)