280X+140Y=240*800X+Y=800
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280X+140Y=240*800X+Y=800
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简 x / y(x+y) - y / x(x+y) =
800x+1200y=436650x+800y=240结果X,Y是多少?
X+Y=240 X=Y+Y+Y X=?Y=?
x十y=240 x=y+y+y x=多少 y=多少
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=?
y=x(x
x+x+x+x+y+y+y=56
{(x,y) |x|+|y|
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)
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x