Найдите значение вырадения. А) (1 -3/4) * (4/5 -3/4) б) 14 * (1/2 +1/3 +1/4) в) 1/3 * 6/7 -1/7 * 3/4 *
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Б) 6/12+4/12+3/12=13/12
В)6/21-3/28=105/588=5\28