Đáp án:
Bài 1:
a, `7^5 . 2^5`
` = (7 . 2)^5`
` = 14^5`
b, `16^4 . 2^7`
`= (2^4)^4 , 2^7`
` = 2^16 . 2^7`
` = 2^23`
c, `8^2 : 49^3`
`= (2^3)^2 : (7^2)^3`
`= 2^6 : 7^6`
`= (2/7)^6`
d, `(8/7)^8 . 64/49`
` = (8/7)^8 . (8/7)^2`
` = (8/7)^10`
e, `5^5 + 5^5 + 5^5 + 5^5 + 5^5`
` = 5^5 . (1 + 1 + 1 + 1 + 1)`
` = 5^5 . 5`
` = 5^6`