作业帮-3(1/2X-2xy+y^2)+1/2(2x^2-xy-2y^2)化简 并将结果按x的降次幂排列
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-3(1/2X-2xy+y^2)+1/2(2x^2-xy-2y^2)化简 并将结果按x的降次幂排列
-3(1/2X-2xy+y^2)+1/2(2x^2-xy-2y^2)化简 并将结果按x的降次幂排列
-3(1/2X-2xy+y^2)+1/2(2x^2-xy-2y^2)化简 并将结果按x的降次幂排列
-3(1/2x^2-2xy+y^2)+1/2(2x^2-xy-2y^2)
=-3/2x^2+6xy-3y^2+x^2-1/2xy-y^2
=-1/2x^2+11/2xy-4y^2
计算3xy[2xy-x(y-2)+x-1]
xy(xy+1)+xy+3-2(x+y+1/2)-(x+y-1)^2因式分解
(-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)]
.(x+y-2)(x+y-2xy)+(xy-1)^2
(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y
因式分解x^2y^2+x^2y+xy^2+3xy+x+y+1
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
(-xy^-1)^2*(-xy^-2)^-3/(-x^2y^3)
y^3+xy^2+2xy+x^2-1 因式分解
5x^2y/-1/2xy*3xy^2
( )-(x^2+3xy)=-xy-1/3y^2
5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
化简!1、（x^2-xy）+xy+y^2 2、3（x^2-xy）-xy+y^2
（x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=