53 : 3 8/15 - 15,8 + 1 5/11 = 36/55
1) 53 : 3 8/15 = 53 : 53/15 = 53 * 15/53 = 15
2) 15 - 15,8 = - 0,8
3) - 0,8 + 1 5/11 = - 8/10 + 16/11 = - 88/110 + 160/110 = 72/110 = 36/55
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53 : 3 8/15 - 15,8 + 1 5/11 = 36/55
1) 53 : 3 8/15 = 53 : 53/15 = 53 * 15/53 = 15
2) 15 - 15,8 = - 0,8
3) - 0,8 + 1 5/11 = - 8/10 + 16/11 = - 88/110 + 160/110 = 72/110 = 36/55