1/3X^2-(3X^2+3XY-3/5Y^2)+(8/3X^2+3XY+2/5Y^2),其中X=-1/2,Y=2
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3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)
1-(3xy-x)+【-2(2x+3xy)】
计算3xy[2xy-x(y-2)+x-1]
整式乘法..1.3xy(x²y-xy²+xy)-xy²(2x²-xy+2x)2.(x-1)(x²-4x+3)-x(x²-5x+2)
化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]}
化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
(xy-3x²)-(-2xy-x²)+(-2x²-3)-(-5+xy)
化简(3X平方-5Xy)+{-X平方-[-3Xy+2(X平方-xy)
5x^2y/-1/2xy*3xy^2
5xy^2-{2x^y-[3xy^2-(xy^2-2x^2y)]/(-1/2xy)}
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
因式分解X^3-2xy+xy^2
已知(x+1)*(x+1)=-Iy-1I,求2(xy-(5xy)*(5xy))-3((xy)*(xy)-xy)
计算:(1)(7-3x)+(5x-6) (2)-(x^2-3)-(7-5x^2) (3)xy-(3x-2xy)+(3xy-2x)
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
(8xy-3x平方)-5xy-2(3xy-2x平方),其中,x=2,y=-1
计算:1-2x+x^2/x-x^3*xy+x^2y/x-x^2
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=