x+20Y=120 x+15Y=125头晕了···不知道怎么解···给个详细步骤哈···
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
已知x+y+y=20,x+y=15求x.y
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
12x+20y=20x+15y
x+x+x+y=20 x+x+y=14 x=?y=?
X[X/（Y+X）+X/（X-Y）]=120/288 求X/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=?
x=15y
x+y=20,x-y=10,y=
y=x(x
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
x^2+y^2=15,x+y=7,x＞y,求x-y
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
x+x+x+x+y+y+y=56