4,18 < b < 4,22
11,47=7,29+4,18 < a+b < 7,31+4,22=11,53
3,07=7,29-4,22 < a - b < 7,31-4,18=3, 13
1/3,13 < 1/(a-b) < 1/3,07
11,47*1,19 < (a+b)*c < 11,53*1,21
11,47*1,19/3,13 < x < 11,53*1,21/3,07
4,36079872 < x < 4,54439739
x=4,45 ± 0,09
4,45=(4,54+4,36)/2
0,09=(4,54-4,36)/2