……………………………………………………………………
Сворачиваем по формуле получаем (22+38)^2= 60^2=3600
(103-3)^2= 10000
(39-19)(39-19)=20*20=400
(63,5-13,5)(63,5-13,5)=50*50= 2500
4m^5-12m^3n^3+9mn^6=m(4m^4-12m^2n^3+9n^6)=m(2m^2-3n^3)^2=m(2m^2-3n^3)<span>(2m^2-3n^3)</span>