a.Log 18
b.Log 21
c.Log 10,5
d.Log 1/7
Diketahui Log 2 = 0,3010; Log 3 = 0,4771; dan Log 7 =0,8451 Tentukan:
Jawaban Terkonfirmasi
Log 18
= log (9×2)
= log (3²×2)
= log 3² + log 2
= 2 log 3 + log 2
= 2 (0,4771 + 0,3010
= 1,2552
log 21
= log (3×7)
= log 3 + log 7
= 0,4771 + 0,8451
= 1,3222
log 10,5
= log (21/2)
= log 21 – log 2
= log (3×7) – log 2
= log 3 + log 7 – log 2
= 0,4771 + 0,8451 – 0,3010
= 1,0212
log 1/7
= log 7⁻¹
= – log 7
= – 0,8541