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4/5:2/8=5/4×2/8=40/10=4/1:1/4=1/4×1/4=1/8
F. 4/5 : 2/8 = 4/5 x 8/2 = 32/10 = 16/5
16/5 : 1/4 = 16/5 x 4/1
= 64/5
= 12*4/5 atau 12,8