Question

2(5a + 3b) + 3(2b - a)​

Answer 1

Теория

$a(b+c) = ab + ac\\a(b-c) = ab - ac$

Решение

$2(5a + 3b) + 3(2b - a)$

$10a + 6b + 6b - 3a$

$7a + 12b$