3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=?

3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=? (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 12y(x-y)^2-8(x-y)^3=? (x+y)(2x-3y)=? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 3x+y=2 -y/x+y=123x+y=2 （-y/x）+y=12 3^x+2x=y,x 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² x-2y=9 x+y+z=7 2x-3y=12 4-12(x-y)+9(x-y)² =(2-3x+3y)² 9y=3x-(x-1),4(x+y)-(2x+4)=8y