1. Calculate 1 / 4 + 3 / 8 + 4 / 10 = 3 / 4 + 3 / 7 = 3 / 8 + 5 / 12= 1. Calculation 1 / 4 + 3 / 8 + 4 / 10= 3 / 4 + 3 / 7= 3 / 8 + 5 / 12= 1 / 3-1 / 4= 1 / 2 + 1 / 5= 1 / 6-1 / 7= 1 / 5 + 1 / 6= 1 / 7-1 / 8= 1 in 8 + 1 in 9= 1 / 2-1 / 3= 1 / 9 + 1 / 10=

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