Question

Срочно помогите Даю 50 балов

Answer 1

1) Г

$\frac{14 {a}^{5} }{ {b}^{6} } \times \frac{b {}^{5} }{56 {a}^{4} } = \frac{a}{4b}$

2) Б

$- \frac{ {a}^{2} b}{12c} \div \frac{ {ab}^{2} }{4c} = - \frac{ {a}^{2}b \times 4c }{12c \times {ab}^{2} } = - \frac{a}{3b}$

3) Д

$( - \frac{2 {a}^{5} }{b {}^{4} } ) {}^{3} = - \frac{2 {}^{3}a {}^{5 \times 3} }{ {b}^{4 \times 3} } = - \frac{8 {a}^{15} }{ {b}^{12} }$

4) А

$\frac{2ab - b {}^{2} }{9a} \times \frac{3a}{b} = \frac{b(2a - b)}{3b} = \frac{2a - b}{3}$