Пошаговое объяснение:

№3

( 7¹⁴ * (7²)³ )/( (7³)⁶ * 7² ) = ( 7¹⁴ * 7⁶ )/( 7¹⁸ * 7² ) =

( 7²⁰ )/( 7²⁰ ) = 1

№4

( 25³ * 125² )/( 5¹⁰ ) = ( (5²)³ * (5³)² )/( 5¹⁰ ) =

( 5⁶ * 5⁶ )/( 5¹⁰ ) = ( 5¹² )/( 5¹⁰ ) = 5² = 25

№5

( 3⁸ * 7⁸ )/( 21⁷ ) = ( 3⁸ * 7⁸ )/(3 * 7)⁷ =

( 3⁸ * 7⁸ )/( 3⁷ * 7⁷ ) = 3¹ * 7¹ = 3 * 7 = 21

№6

( 5⁹ * 4⁶ )/( 20⁶) = ( 5⁹ * 4⁶ )/(5 * 4)⁶ =

( 5⁹ * 4⁶ )/( 5⁶ * 4⁶ ) = 5³ * 1 = 125 * 1 = 125