13/21*(9/26-2 3/13) - ( - 2/3)²= - 1 11/18
1) 9/36-2 3/13=9/26 - 2 6/26= - 1 23/26
2) 13/21*( -1 23/26)= - 13/21 * 49/26= - 7/6= - 1 1/6
3) ( - 2/3)²=4/9
4) - 1 1/6 - 4/9= - 1 3/18 - 8/18= - 1 11/18
5/12+1/6+1/8=20/48+8/48+6/48=20+8+6/48=34/48=17/24
17/24×264000=17×11000=187000
264000-187000=77000
-17/24=24/24-17/24=24-17/24=7/24
7/24×264000=7×11000=77000
ответ: 77000руб остаток
Х + 398 = 217 * 7
х = 1519 - 398
х = 1121