Объяснение:

№1

а)

15х² * 7/6х³ = (15х² * 7)/6х³ = 105х²/6х³ = 35/2х

б)

-6am² * 4a/3m³ = (-6am² * 4a)/3m³ = (-24a²m²)/3m³ = (-8a²)/3m = -8a²/3m

№2

a) (3a²b³/s⁴)² = 9a⁴b⁶/s⁸

б) (9а³/2b²)² = 81a⁶/4b⁴

№3

a)

c/5d² * 25d/c⁴ = 1/d * 5/c³ = 5/c³d

б)

18m³/11n³ * 22n⁴/9m² = m/1 * 2n/1 = 2mn/1 = 2mn

в)

(2х - 1)/(х² - 7х) * (х - 7)/(2х - 1) =

1/х(х - 7) * (х - 7)/1 = 1/х * 1/1 = 1/х