5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
x^2-xy-6y^2+3xy+y+2
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
(-3x^y+2xy)-( )=4x^+xy
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
已知x-y=4xy,则2x+3xy-2yx-2xy-y
x*-2xy+3y*=9 4x*-5xy+6y*=30
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
5x^2y/-1/2xy*3xy^2
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1