0,11n-0,87n-0,91n+0,87n+2= -0,8n+2
при n= -1,5
-0,8n+2=1,2+2=3,2
(6х+3)*4=132
6х + 3 = 132 : 4
6х + 3 = 33
6х = 33 - 3
6х = 30
х = 30 : 6
х = 5
ПРОВЕРКА:
(6 * 5 + 3) * 4 = 132
(30 + 3) * 4 = 132
33 * 4 = 132
132 = 132
1 1/7 - 5/7 = 3/7
2 3/11 - 7/11 = 1 7/11
3 9/17 -11/17 = 2 15/17
4 7/27 - 1 16/27 = 2 2/3