5/9 + 1 5/7 * ( 4 2/3 - 2 5/8) : 1 3/4 = 2 5/9
1) 4 2/3 - 2 5/8 = 4 16/24 - 2 15/24 = 2 1/24
2) 1 5/7 * 2 1/24 = 12/7 * 49/24 = (1*7)/(1*2) = 7/2 = 3 1/2
3) 3 1/2 : 1 3/4 = 7/2 : 7/4 = 7/2 * 4/7 = 4/2 = 2
4) 5/9 + 2 = 2 5/9
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