2x—3y+5=0 3x+2y=12 y=2x 7x—3y=4 Y+1=三分之x+1 2x—3y=1 方程组前面两个是一起的
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已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(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
12y(x-y)^2-8(x-y)^3=?
3x—y=5 ,5x+2y=12 ,x=?y=?
3x+y=2 -y/x+y=123x+y=2 (-y/x)+y=12
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0