Номер 836 полностью, пожалуйста, буду благодарна

Решите задачу:

$2(x-y)+(x-y)^{2}=(x-y)(2+(x-y))=(x-y)(2+x-y) \\ (a+b)^{2}-(a-b)(a+b)=(a+b)(a+b-(a-b))=(a+b)*2b \\ x(x-y)^{2}-y(y-x)^{2}=x(x-y)^{2}-y(x-y)^{2}=(x-y)^{2}(x-y)= \\ =(x-y)^{3}$
$(x-y)+x(y-x)=(x-y)-x(x-y)=(x-y)(1-x) \\ n(m-n)^{2}-(n-m)^{3}=n(n-m)^{2}-(n-m)(n-m)^{2}= \\=(n-m)^{2}(n-(n-m))=(n-m)^{2}*m \\ a(a-c)^{2}-c(a-c)(c-a)=a(a-c)^{2}+c(a-c)(a-c)= \\ =(a-c)^{2}(a+c)$