Question

Пожалуста срочно!!!

Answer 1

3)
$2a \times {a}^{2} \times 3b + a \times 8c = 6 {a}^{3} b + 8ac = 2a(3 {a}^{2} b + 4c)$
5)
$11 {a}^{5} - 8 {a}^{5} + 3 {a}^{5} + {a}^{5} = 7 {a}^{5}$
7)
$20xy + 5yx - 17xy = 20xy + 5xy - 17xy = 8xy$

Answer 2

3) 2а•а²•3b + a •8c = 2a+a•a²•3b•8c = 3a²•3b•8c