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1 1 4 + 10
3 ---- + 4 ---- = 7 ---------------- = 7 14/40 = 7 7/20
10 4 40
1 x 4 4 1 x10 10
3 ---- = 3 ------ 4 ---- = 4 -----
10x4 40 4 x10 40
40 = harus sama biar hitungnya gampang.