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3 ¼ lusin =
= 12 x 3¼
= 12 x 13/4
= 156/4
= 39 buah
1 lusin : 12 buah, 1/2 lusin :6 buah.
3/4= 9 buah karena 1/4: 3 buah jadi 1/2+1/4=3/4=6+3=9buah. Sudah faham?