5x-y=51,x-y=3,则x= ,y=
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5x-y=51,x-y=3,则x= ,y=
5x-y=51,x-y=3,则x= ,y=
5x-y=51,x-y=3,则x= ,y=
1-2得4x=48,解得x=12,代入得12-y=3,解得y=9
所以x=12,y=9
x=12,y=9
x=12 y=9
x=12 y=9
x=12,y=9
(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
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若3x=5y,则x:y=________,(x-y):y=______
5x-y=51,x-y=3,则x= ,y=
化简 x / y(x+y) - y / x(x+y) =
(x+y)/y=8/3则x/y=__ y/x-y=___
(x+y)/y=8/3则x/y=__ y/x-y=___
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
x+y/y=5/4,则x/y=----------------
如果x/y=3则x+y/y
(5x-6y)(x+y)=0(x不等于y),则y/x=
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11