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5/7 * 4,2 - (1 1/4 - 0,5) = 5/7 * 4 2/10 - ( 1 1/4 - 5/10) = 5/7 * 42/10 - (5/4 - 5/10) = 6/2 - (25/20 - 10/20) = 6/2 - 15/20 = 60/20 - 15/20 = 45/20 = 2 1/4
4 1/2 - 2,4 : 2 2/3 + 1,4 = 9/2 - 24/10 * 3/8 + 14/10 = 9/2 - 9/10 + 14/10 = 45/10 - 9/10 + 14/10 = 5