Выполните вычитание дробей:а)3 1/2 -5/9; б)1 1/4 -1/3;  в)1 13/15 - 2/5; г)1 1/3-5/6 ;д) 2 3/10-4/15 ; е)3 1/8 -1/6 
Помогите SOS !!!!Срочно 

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