计算[-(-2x^2y)^3]^2·(-3x^3y^2)
计算(1)[-(-2x^2y)^3]^2·(-3x^3y^2)(2)(x^2n-1)^2·(x^2)^3-2n·(-x^2n-3)注明过程...
计算(1) [-(-2x^2 y)^3]^2·(-3x^3 y^2)
(2) (x^2n-1)^2·(x^2)^3-2n·(-x^2n-3) 注明过程 展开
(2) (x^2n-1)^2·(x^2)^3-2n·(-x^2n-3) 注明过程 展开
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[(x+y/x-y)^2*(2y-2x/3x+3y)]-[(x^2/x^2-y^2)/(x/y)]={[(x+y)/(x-y)]^2*(2y-2x)/(3x+3y)}-[x^2/(x^2-y^2)*y/x]=-{[(x+y)/(x-y)]^2*2(x-y)/3(x+y)}-[x^2/(x^2-y^2)*y/x]=-(x+y)/(x-y)-[x/(x^2-y^2)*y]=-(x+y)/(x-y)-[xy/(x^2-y^2)]=-(x+y)^2/(x^2-y^2)-[xy/(x^2-y^2)]=-[(x+y)^2+xy]/(x^2-y^2)]=-(x^2+y^2+2xy+xy)/(x^2-y^2)=-(x^2+y^2+3xy)/(x^2-y^2)
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