³log 1 / 9 - ³log 1 / 27 adalah... A.-5 B.-4 C.-1 D.1 E.2 Pake cara ya... Mohon bantuannya ^-^
Matematika
Emotion101
Pertanyaan
³log 1 / 9 - ³log 1 / 27 adalah...
A.-5
B.-4
C.-1
D.1
E.2
Pake cara ya...
Mohon bantuannya ^-^
A.-5
B.-4
C.-1
D.1
E.2
Pake cara ya...
Mohon bantuannya ^-^
2 Jawaban
-
1. Jawaban Narethasary
3^Log1/9-3^Log1/27 = 3^Log3^-2 - 3Log3^-3
= -2 x 3^Log3 - (-3)3^Log3
= -2 - (-3)
= -2 + 3
= 1
jawabannya D. 1 -
2. Jawaban andri77
=³log(1/9) - ³log(1/27)
=³log(1/(3^2)) - ³log(1/(3^3)) (9 = 3^2)
=³log(3^-2) - ³log(3^-3) (ingat jika ada 1/a = a^-1)
=-2.³log3 - (-3) ³log3 (ingat jika ada alogb^n = n . alogb)
=-2 . 1 + 3 .1 (ingat jika ada aloga= 1)
=-2 + 3
=1
Jadi Jawabannya : D