X*0.17=Y X+Y=500

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X*0.17=YX+Y=500X*0.17=YX+Y=500X*0.17=YX+Y=500X+Y=500x+0.17x=5001.17x=500x=500÷1.17x≈427.35y=500-x=50

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 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. D：y>=x,y y'/y=1/x x+y=5; x^y+y^x=17