assalamualaikum..kakak yang baik hati,tolong bantu saya kak..

jawab

1)
²⁵log 49√7 - ²⁵log √7 =
= ²⁵log (49√7 /√7)
= ²⁵log 49
= ⁵^²log 7²
= (2/2). (⁵log 7)
= ⁵log 7


2) log 3 = 0,477 . log 5 = 0,699
log 3/5 = log 3 - log 5
= 0,477 - 0,699
= -0,222

3) ²log 125. ⁵log 81 =
= ²log 5³. ⁵log 3⁴
= (3) (²log 5). (4). (⁵log 3)
= (3)(4). (²log 5.⁵log 3)
= 12 .²log 3