3(4x+6y)(4x-6y)-(-3x+4y(-4y-3x)

(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 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 4x-3y/x-2y÷6y-8x/y-2x （x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 .. （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 （y-x）^4（x-y）^3+2（x-y）^6（y-x） -4(x-y)平方-(x-y)+3(y-x)+6(y-x)平方 化简 （y-x)+x(x-y)^3-(y-x)^4 因式分解 化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²(X-Y)视为整体 计算：（3x-4y）-[-（2y+x）+（x-3y）]-6x 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 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