5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
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5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}5xy^2-{2x^y-[3xy
5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
原式=5xy^2-[2x^2y-(3xy^2-xy^2+2x^2y)/（-1/2xy）]
=5xy^2-[2x^2y-(2xy^2+2x^2y)/（-1/2xy）]
=5xy^2-(2x^2y+4y+4x)
=5xy^2-2x^2y-4y-4x
答案是=5xy^2-2x^y-4x^2y^3-4x^3y^2
2x²y-3(2xy-xy)-xy
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
5x^2y/-1/2xy*3xy^2
2xy+5y^2+( )=x^2+3xy
化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]}
计算：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2
5xy^2-(3xy^2-(4xy^2-2x^2y))+2x^2y-xy^2求
5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）}
5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y（化简）
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
2x平方y-2xy+3xy平方+5+2xy+x平方y-3xy平方-3 过程!
已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
已知xy^2=-2xy(x^2y^5-xy^3-y)
xy^2=-3,求-xy(x^2y^5-xy^3-y)
((xy+2)(xy-2)-2x²y²+5(xy-y)²)÷(2xy)