(-3/4x^2y-3/5xy^2+1)(-2/3xy)^2
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
5x^2y/-1/2xy*3xy^2
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
计算3xy[2xy-x(y-2)+x-1]
(-3x^y+2xy)-( )=4x^+xy
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知x-y=4xy,则2x+3xy-2yx-2xy-y
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值