Найдите значения выражений: 1) 1/9 + 4/9; 2) 7/8 - 3/8; 3) 15/19 - 6/19; 4) 5/16 + 1/16 5) 3/14 + 11/14 6) 11/21 + 4/21;
помогите пожалуйста, если не трудно ​
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