срочно 50б а)7-4 5/9 б)6 15/21+2 9/14 в)4 3/10+1 5/12 г)5 1/6 -3 3/4

а)7-4 5/9 = 2 4/9 б)6 15/21+2 9/14 = 6 5/7 + 2 9/14= 6 10/14 + 2 9/14 = 9 5/14 в)4 3/10+1 5/12 = 43/10 + 17/12 = 516/120+170/120=686/120=5 43/60 г)5 1/6 -3 3/4 = 31/6 - 15/4 = 62/12-45/12 = 17/12 = 1 5/12