X+Y+500=9000
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X+Y+500=9000
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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+0.5y=500 x=?y=?
X*0.17=Y X+Y=500
X-Y=500 (X-300)/Y*100%=120%
y-x=500 0.13x+0.13y=351
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=?
y=x(x
x-500=45%y x+y=2050x=?y=?
2y=-x+400 y=-2x+500 求X Y
x+x+x+x+y+y+y=56
5X+6Y=500,4X+1Y=5Y+1X,X>Y,X=?,Y=?
x+x+x+y+y=6.4 y+y+y+x+x=7.1 怎么算?
二元函数f(x,y)=x+y/x-y,求f(y/x,x/y)
x-y/x+y=(x-y)²/x²-y²(x≠y)