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)
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