Mohon bantuannya yah​

Penjelasan dengan langkah-langkah:

1. 5^2 – 5^1 + 5^0

= 25 – 5 + 1

= 21

2. (-3)^2 + (-3)^3 + (-3)^-1

= 9 + (-27) + (-1/3)

= -18 + (-1/3)

= -181/3