Question

помогите срочнооооо....

Answer 1

$xm^{12}+xy^{12}-ym^{12}-y^{13}=(xm^{12}-ym^{12})+(xy^{12}-y^{13})=$$m^{12}(x-y)+y^{12}(x-y)=(x-y)(m^{12}+y^{12})$