4/10 - 4/5 x 1/2, 2/3 - 2/3 x 1 , 12/50 - 4/10 x 3/5, 18/28 - 6/7 x 3/4, 22/80 - 11/20 x 2/4 = , 6/5 - 3 x 2/5,

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