x+x=y+30
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x+x=y+30
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
{6/x+y+10/x-y=30 6/x+y-10/x-y=-1
x+y=30,x方+y方=458,求x,y求x,y
化简 x / y(x+y) - y / x(x+y) =
y=x(x
x+x+x+y=42 x+y+y+y=30 求x=( )y=( )
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+x+x+x+y+y+y=56
x+x+x+y+y=75 ,x+y=30 x= y= 字母代表什么数?
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
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
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=?