200(x-y)=400 100(x+y)=400,求X和Y
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200(x-y)=400100(x+y)=400,求X和Y200(x-y)=400100(x+y)=400,求X和Y200(x-y)=400100(x+y)=400,求X和Y200(x-y)=4001
200(x-y)=400 100(x+y)=400,求X和Y
200(x-y)=400 100(x+y)=400,求X和Y
200(x-y)=400 100(x+y)=400,求X和Y
200(x-y)=400
100(x+y)=400
那么
x-y=2
x+y=4
解得
x=3,y=1
200(x-y)=400 100(x+y)=400,求X和Y
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
14x+4y+z=200,x+y+z=100求解x,y,z
二元一次方程帮忙解下(1)12.5x+13.3y-200=12x+13.5y12.9x+13.9y-1300=12.5x+13.3y x=?y=?(2)200x+150y=5500150x+100y=4000 x=?y=?(3)x+y=68100x+y-100y-x=2178 x=?y=?
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
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+y=85 x+x+y+y+y=200 问x与y分别是多少?
328-y/y x 100％=-18％
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)