-3(2x^2-xy)+4(x^2+xy-6)
-3(2x^2-xy)+4(x^2+xy-6)
-3(2x²-xy)+4(x²+xy-6)
(-3x^y+2xy)-( )=4x^+xy
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
[3xy(1-x)-6xy(x-1/2)]*2x*(-xy)平方,x=-1 y=2 ; 3xy平方(-1/3x平方y+4
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
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
-3(2x-xy)-4(-6+xy+x.其中x=1,y=-1
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]