Выполните Вычитание;

1) 7/15-3/25;3/4-1/6;7/8-5/12

2) 11/40-9/50;11/18-7/15;29/42-17/63

3)14/15-5/9;11/16-7/8-5/12

4)7/10-4/15;11/17-21/44-23/55

(помогите срочно)
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