Question

помогите!    по многочленам
7a×(3b-21c)=
(7ab+5a)(55b-2a)=
13ab×(3ca-9ab)=

75a×(15a-3a+6a)=
(5a+3c)(3c-5c)=
(17a+3b)(11a-5b)=

Answer 1

АПУПЕЕЕТЬ!!!!!!!!!!!!!

Answer 2

1.21аб-147ас
2.
3.
4.
5.9с2-25с2=-16с2