(-3x^3y^2)^3·(-4x^2y^3)÷(-6x^4y^4)
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
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(x+3y-4)(2x-y)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)+2x^4y^2÷(xy)^2
[(x+y)^3]^6-3[(x+y)^3]^6X(x+y)^4X(-x-y)^2
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y