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4/7 · 1 3/4 · 3 1/2 = 4/7 · 7/4 · 7/2 = 1 · 7/2 = 7/2 = 3 1/2
1 5/8 · 3 1/5 · 2/26 = 13/8 · 16/5 · 1/13 = 2/5