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5/6 + 3/8
19/31 - 11/15
21/22 - 3/55
5/42 + 10/63
11/21 - 2/35
5/24 + 7/60

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5/6 + 3/8 = 20/24 + 9/24 = 29/24 = 1 5/24,19/31 - 11/15 = 285/465 - 341/465 = -56/465,21/22 - 3/55 = 105/110 - 6/110 = 99/110 = 9/10,5/42 + 10/63 = 15/126 + 20/126 = 35/126 = 5/18,11/21 - 2/35 = 55/105 - 6/105 = 49/105,5/24 + 7/60 = 25/120 + 14/120 = 39/120 = 13/40

РЕШАЕМ вместе5/6 + 3/8 = (5*4+3*3)/24 = 29/24 = 1 5/24 НОК=6*8=2419/31 - 11/15 = -56/465 НОК=15*31=46521/22 - 3/55 = (21*5 - 3*2)/110= 99/110 = 9/10  НОК =1105/42 + 10/63 = 5/18 НОК=12611/21 - 2/35 = 7/15 НОК=1055/24 + 7/60 = (5*5+2*7)/120 = 39/120 = 13/40  НОК=120