(-3x^2)^3*(-4y^3)^2/(6x^2y)^3怎么算

1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y( 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 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 (2x-3y)-(5x-y)怎么算 x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8 (x+3y-4)(2x-y) (-2x+6y)的平方-(3x+2y)(2x-3y)+(-9y)*4怎么化简 x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2 [(x+y)^3]^6-3[(x+y)^3]^6X(x+y)^4X(-x-y)^2 因式分解3x^2(x-y)+6x(y-x)