4x-2y-6y*-y-3x+5y* *=2 就是平方

因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) [2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 4x-2y-6y*-y-3x+5y* *=2 就是平方 4x-2y-6y平方-y-3x+5y平方 化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90) (3x-4y)(5x-4y)-(7x-8y)(6y-5x) 5/4(x+y)(-x-y)^3*[-4/3(x-y)]*[-3/5(y-x)^2] 2(2x+3y)(3x+2y)-(6x-y)(2x-5y) x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 {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）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 .. 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 5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解 5x^3y(x-y)^3-10x^4y^3(y-x)^2 4x-3y/x-2y÷6y-8x/y-2x