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2log45 bisa di jabarkan lagi menjadi 2log3+2log3+2log5
2logV15 bisa dijabarkan menjadi 2log15^1/2 = 1/2 ( 2log3+2log5). sehingga,
=(2log3+2log3+2log5)+(1/2.2log3+1/2.2log5)
=(x+x+y)+(1/2x+1/2y)
=2x+y+1/2x+1/2y
=5/2x+3/2y
=1/2 (5x+3y)