作业帮120/(x-y)+120/(x+y)=160/y 怎样化简成x＝2y和x＝-1/2y
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120/(x-y)+120/(x+y)=160/y 怎样化简成x＝2y和x＝-1/2y
120/(x-y)+120/(x+y)=160/y 怎样化简成x＝2y和x＝-1/2y
120/(x-y)+120/(x+y)=160/y 怎样化简成x＝2y和x＝-1/2y
两边同时乘以y(x-y)(x+y),得
120y(x+y)+120y(x-y)=160(x-y)(x+y)
3xy+3y^2+3xy-3y^2=4x^2-4y^2
2x^2-3xy-2y^2=0
(2x+y)(x-2y)=0
x=2y或x=-1/2y
X[X/（Y+X）+X/（X-Y）]=120/288 求X/Y
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
130*x+120*y=14760 x+y=117
X-Y=500 (X-300)/Y*100%=120%
150/x+120/y=30 x-y=2
160/x+120/y=130,求x,y
60x+120y=360 x、y等于?
化简 x / y(x+y) - y / x(x+y) =
求解二元一次方程组120/(x+y) + 80/(x-y)=1630/(x+y) + 60/(x-y)=8120/(x+y) + 80/(x-y)=1630/(x+y) + 60/(x-y)=8
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x一y=120 x÷y=3 x和y分别等于几?
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
120/(x-y)+120/(x+y)=160/y 怎样化简成x＝2y和x＝-1/2y
120/(x-y)+120/(x+y)=160/y 怎样化简成x＝2y和x＝-1/2y 急!急!在线等!
24/x+24/y=120/x+20/y+20/y=1