Question

к/р помогите . срочно

Answer 1

2.
а)
$xy(2 - 3y)$
б)
$2 {b}^{3} (4b + 1)$
$3)7 - 12x + 4 = 5 - 10x \\ 11 - 12x - 5 + 10x = 0 \\ 6 - 2x = 0 \\ 2x = 6 \\ x = 6 \div 2 = 3$