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5log2 = b
12log15 = 3log3 x 3log2² perr 3log3 x 3log5
= 1 + 2ab + 1 + a
= 2 + 2ab + a
itu kan 3log2 sedangkan disitu ga ada pilihannya kan??
nahh, 3log2 itu seperti sifat ini 3log5 x 5log2 = 3log2
jadi ab
1,176÷1,079=1,089