(4x^2+3xy+5y^2)-( )=4x^2-3xy-5y^2 括号里填什么?
(4x^2+3xy+5y^2)-( )=4x^2-3xy-5y^2 括号里填什么?
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
2xy-{5x-3[xy-1/3x(y+1)]-4xy} 去掉括号,并合并.
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
(-3x^y+2xy)-( )=4x^+xy
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
x*-2xy+3y*=9 4x*-5xy+6y*=30
(21x^4y^3-35x^3y^2+7x^2y^2)÷【】=-3x^2y^2+5xy-y.【】里填什么?
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
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
5xy平方-2x平方y+[3xy平方-(4xy-2x平方y-2x平方y)],其中x=-2,y=-1求值