xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
(-3x^y+2xy)-( )=4x^+xy
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
(xy-x^2)乘以(xy)/(x-y)
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
x^2-xy-6y^2+3xy+y+2
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
已知x+xy=-2,xy-y=-6求代数式2x{-4y-3[(x+xy)²+x]-½[(y-xy
[3xy(1-x)-6xy(x-1/2)]*2x*(-xy)平方,x=-1 y=2 ; 3xy平方(-1/3x平方y+4