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= 2² log 5² x 5 log 2 pangkat 4
= (2/2) 2 log 5 x 4 . 5 log 2
= 4 . 2 log 5 x 5 log 2
= 4 . 1
=1
2) (3√5 + 12)x(10√5-5)
= 30 . 5 - 15√5 +120√5 -60
= 90 + 105√5
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