Question

a/3b*5b/7a/
/ - дробь

Answer 1

$\cfrac{a}{3b} \times \frac{5b}{7a} = \frac{a \times 5b }{3b \times 7a} = \frac{5}{21}$

Answer 2

$\frac{a}{3b} \times \frac{5b}{7a} = \frac{5ab}{21ab} = \frac{5}{21}$