Ответ:

1) (b⁴)⁶×(b⁵)⁴=b⁴*⁶×b⁵*⁴=b²⁴×b²⁰=

=b²⁴+²⁰=b⁴⁴

2) (b¹⁶)⁴:(b³)²⁰=b¹⁶*⁴:b³*²⁰=b⁶⁴:b⁶⁰=

=b⁶⁴-⁶⁰=b⁴

3) (b⁹)¹²:(b¹⁰)¹⁰=b⁹*¹²:b¹⁰*¹⁰=b¹⁰⁸-¹⁰⁰=

=b⁸

4) (b³⁰)³:(b⁴)²⁰=b⁹⁰:b⁸⁰=b¹⁰

5) (b³)⁷×(b⁵)⁵=b²¹×b²⁵=b⁴⁶

6) (b⁷)⁶:(b⁸)⁵=b⁴²:b⁴⁰=b²