若(-x+6):(x-y):(4x+y)=3:14:1,求x+y

若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 若X-Y>X,X+Y x(x-y)+4(y-x)因式分解 {(x,y) |x|+|y| x>y?x:y (x+y)(x-y)+4(y-1) (x+4y-6)(x-4y+6)-(4y+x+6)(4y-x-6) 若5x-4y=6,4x-5y=8,则x+y=( ),x-y=( ) 若5x+3y=3x+4y=x+2y+6,则x+y=___ 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 (3x-4y)(5x-4y)-(7x-8y)(6y-5x) {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 （y-x)+x(x-y)^3-(y-x)^4 因式分解 4x-3y/x-2y÷6y-8x/y-2x