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12/10 : 2/5 × 1 3/4
12/10 × 5/2 × 7/4
420/80
5 1/4
Jawabannya d. 5 1/4
#Maaf kalau salah
= (12/10 x 5/2) x 7/4
= 3 x 7/4 = 21/4
= 5 1/4