X-Y=10000 Y/X=35/100求答案

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X-Y=10000 Y/X=35/100求答案
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X-Y=10000 Y/X=35/100求答案
X-Y=10000 Y/X=35/100求答案

X-Y=10000 Y/X=35/100求答案
Y/X=35/100 令Y=35t X=100t 则X-Y=65t=10000
t=2000/13 X=200000/13 Y=70000/13


令x=100t，则y=35t
100t-35t=10000
65t=10000
t=2000/13
x=200000/13
y=70000/13

由Y=35X/100代入
X-35X/100=65X/100=10000
x=1000000/65=200000/13
Y=X-10000=1000000/65-10000=10000*35/65=70000/13

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+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=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+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 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. 360/(x+y)+360/(x-y)=35 360/(x+y)=360+(x-y)=5 y 328-y/y x 100％=-18％ D：y>=x,y y'/y=1/x