помогите пожалуйста дроби. Вычислите: 1) 25/28- 2/12; 2) 41/54-35/72; 3) 20/21-3/14; 4) 40/143+39/110; 5) 43/140+41/150; 6) 73/80-37/100;

1) 25/28 - 2/12 = 75/84 - 14/84 = 61/84

25/28-2/12=25/28-1/6=75/84-14/84=61/84

41/54-35/72=164/216-105/216=59/216

20/21-3/14=40/42-9/42=31/42

40/143-39/110=4400/15730-5577/15730=-1177/15730

43/140-41/150=645/2100-574/2100=71/2100

73/80-37/100=730/800-296/800=434/800=217/400

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