X*0.17=Y X+Y=500
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X*0.17=Y X+Y=500
X*0.17=Y X+Y=500
X*0.17=Y X+Y=500
X+Y=500
x+0.17x=500
1.17x=500
x=500÷1.17
x≈427.35
y=500-x=500-427.35=72.65
先有等式x*0.17=500,求出x
在由yx+y=500,求出y
x=250,y=250
x=12/7,y=12/7
X+0.17X=500
X=427.35
Y=72.65
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*0.17=Y X+Y=500
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-(X*0.17)=Y x=多少?Y已知.
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
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D:y>=x,y
y'/y=1/x
x+y=5; x^y+y^x=17