1、-(xy)^3*(-y)(xy)^2*(xy^3)^2*(-x)^3 2、-a*a^5-(-2a^3)^2+(a^2)^3 3、8^90*(1/2)^90*(1/2)^180*(-0.125)^2005*(-8)^2006

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1、-(xy)^3*(-y)(xy)^2*(xy^3)^2*(-x)^3 2、-a*a^5-(-2a^3)^2+(a^2)^3 3、8^90*(1/2)^90*(1/2)^180*(-0.125)^2005*(-8)^2006

1、-(xy)^3*(-y)(xy)^2*(xy^3)^2*(-x)^3 2、-a*a^5-(-2a^3)^2+(a^2)^3 3、8^90*(1/2)^90*(1/2)^180*(-0.125)^2005*(-8)^2006
1、-(xy)^3*(-y)(xy)^2*(xy^3)^2*(-x)^3
2、-a*a^5-(-2a^3)^2+(a^2)^3
3、8^90*(1/2)^90*(1/2)^180*(-0.125)^2005*(-8)^2006

1、-(xy)^3*(-y)(xy)^2*(xy^3)^2*(-x)^3 2、-a*a^5-(-2a^3)^2+(a^2)^3 3、8^90*(1/2)^90*(1/2)^180*(-0.125)^2005*(-8)^2006
1、-(xy)^3*(-y)(xy)^2*(xy^3)^2*(-x)^3
=-x^3y^3*(-y)(x^2y^2)(x^2y^6)(-x^3)
=-x^10y^12
2、-a*a^5-(-2a^3)^2+(a^2)^3
=-a^6-4a^6+a^6
=-4a^6
3、8^90*(1/2)^90*(1/2)^180*(-0.125)^2005*(-8)^2006
=2^270*(1/2)^90*(1/2)^180*(-0.125)^2005*(-8)^2005*(-8)
=[2^270*(1/2)^90*(1/2)^180]*[(-0.125)^2005*(-8)^2005]*(-8)
=1*1*(-8)
=-8

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)] (-xy^-1)^2*(-xy^-2)^-3/(-x^2y^3) (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] 计算 -6xy(-1/3xy+2/3y-1) ( )-(x^2+3xy)=-xy-1/3y^2 XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2) y^3+xy^2+2xy+x^2-1 因式分解 5x^2y/-1/2xy*3xy^2 计算3xy[2xy-x(y-2)+x-1] 2x²y-3(2xy-xy)-xy 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 当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值 (-3xy+2xy)-(4xy+xy) 已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得：x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎 计算（3x^2y-xy^2+1/2xy）/（-1/2xy） 3xy^2-(XY^2-2X^2Y)÷(1/2xy)