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65/100 diperkecil menjadi 13/20
13/20 : 7/10 = 13/20 × 10/7
; = 13/2 × 1/7 (caranya 20 : 10 = 2, 10 : 10 = 1. Kalo ditulis di buku 20 sama 10 dicoret terus diganti)
= 13/14 : 3 5/7
= 13/14 : 26/7
= 13/14 × 7/26
= 13/2 × 1/26 ( caranya sama kayak yang tadi)
= 13/52
= 1/4
Jadi 65% : 7/10 : 3 5/7 = 1/4