（5x^2y^3-4x^3y^2+6x)/(6x).(1/3x^3m*y^2n-x^2m-1*y^2+3/4x^2m+1*y^3)/(-0.5x^2m-1*y^2)

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 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 【(4x-3y)(4x+3y)-(2x-3y)(5x+3y)]除以6x 化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90) 2(2x+3y)(3x+2y)-(6x-y)(2x-5y) 5/4(x+y)(-x-y)^3*[-4/3(x-y)]*[-3/5(y-x)^2] x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 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 (2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算 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）/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 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1