1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
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1、(-7x^y)(2x^y-3xy^3+xy)2、((x-y)^6)/((y-x)^3)/(x-y)1、(-7x^y)(2x^y-3xy^3+xy)2、((x-y)^6)/((y-x)^3)/(x-
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
1、(-7x^y)(2x^y-3xy^3+xy)
=-14x^(2y)+21x^(y+1)y^3-7x^(y+1)y;
2、((x-y)^6)/((y-x)^3)/(x-y)
=-(x-y)^3/(x-y)
=-(x-y)^2;
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