Решите дроби 7/15+8/15 35/78-26/78 124/150-20/150 90/150+30/150 1-8/80 1-28/60 105/300+120/300 120/300-40/300 235/300-60/300 38/80-8/80

Question

Александра Котова

Математика

19 ноября, 17:15

Решите дроби 7/15+8/15 35/78-26/78 124/150-20/150 90/150+30/150 1-8/80 1-28/60 105/300+120/300 120/300-40/300 235/300-60/300 38/80-8/80

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Анна Назарова · Answer 1

Вычислим значение дробей: 7/15 + 8/15 = (7 + 8) / 15 = 15/15 = 1; 35/78 - 26/78 = (35 - 26) / 78 = (30 - 20 + 5 - 6) / 78 = (10 - 1) / 78 = 9/78 = 3/26; 124/150 - 20/150 = (124 - 20) / 150 = 104/150 = 52/75; 90/150 + 30/150 = (90 + 30) / 150 = 120/150 = 12/15 = 4/5; 1 - 8/80 = 80/80 - 8/80 = (80 - 8) / 80 = 72/80 = 9/10; 1 - 28/60 = 60/60 - 28/60 = 32/60 = 8/15; 105/300 + 120/300 = (105 + 120) / 300 = 225/300 = 15/20 = 3/4; 120/300 - 40/300 = 80/300 = 8/30 = 4/15; 235/300 - 60/300 = 175/300 = 35/60 = 7/12; 38/80 - 8/80 = 30/80 = 3/8.