Примеры:
1) 7 - 13 : (192 - 184) = 7 - 13 : 8 = 7 - 13/8 =
= 56/8 - 13/8 = 43/8 = 5 3/8
2) -73 + 24 - 58 + 96 = 96 + 24 -(73+58) =
= 120 - 131 = - 11
3) -21/20 • (-5)/9 - 5/14 • (-22/5) =
= 21•5/(20•9) + 5•22/(14•5) =
= 7/12 + 11/7 = 49/84 + 132/84 = 181/84 = 2 13/84
Задача:
11 : 5/7 = 11 • 7/5 = 77/5 = 13 2/5 - искомое число.