Помогите пожалуйста!!!!??!?
= (49am-21au)+(21mu-49m²) = 7a(7m-3u)-7m(7m-3u) = (7m-3u)(7a-7m)
(7a-7m)(7m-3u) 49am-21au+21mu-49m^2=7a(7m-3u)-7m(3u-7m)