1. 11 = ( 112 - а ) :7 -2
11 = (16 - а : 7) -2
13 = 16 - а : 7
3 = а : 7
а = 21
2. 2 = ( 14х + 42) :7 - 2
2 = ( 2х + 6) - 2
4 = 2х + 6
2х = -2
х= -1
1.11=(14*8-а):5
11=(112-a):=5
11=22,4-a/5
11-22,4=a/5
-11,4=a/5
-11,4*5=a
a=-57
