7 1/3 : (7/9-9/5)-2*1 1/4

Question

7 1/3 : (7/9-9/5)-2*1 1/4

Comments

Даю 40 баллов!

Answer 1

71/3 : (7/9-9/5)-2*11/4
1)  7/9 - 9/5 = 5*7/5*9 - 9*9/9*5=35/45 - 81/45 = -46/45
2) 71/3 : (-46/45) = 71/3 * (-45/46) = 71*(-45)/3*46=71*(-15)/1*46=-1065/46
3)  2 * 11/4 = 2/1 * 11/4 = 2*11/1*4=22/4 =2*11/2*2=11/2
4)  -1065/46 - 11/2 = -1065/46 - 23*11/23*2=-1065/46-253/46=-1308/46=
=-28 20/46= -28целых 10/23 
Ответ: 28 10/23