Вычислите: 3/5 -4/5; 2/7-(-3/7); -1/2-1/4; -2/9-(-1/3); -4,8-5,9; 7-9,13<br />найдите значения вырожения : (3,5-2,9)-(3,7-9,1);
(2/5-2/3)-(2/7-3/5)
(2/5-2/3)-(2/7-3/5)
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2. = 5/7
3. = -4/4
4. = 1/9
5 = -10,7
6.= -2,13
значение выражения 1. = 6
2. = 1/21