Ответ:
6.23 + 8.38 + (-5.38) + 6.23 = 15.46
6.23 + 8.38 = 14.61
14.61 - 5.38 = 9.23
9.23 + 6.23 = 15.46

[tex]\frac{9}{13}+(-\frac{39}{4}) + (-\frac{11}{13}) + \frac{3}{22} =-9\frac{439}{572}[/tex]
[tex]\frac{9}{13} + (-\frac{11}{13}) =-\frac{2}{13}[/tex]
[tex](-9\frac{3}{4}) + \frac{3}{22} = -9\frac{27}{44}[/tex]
[tex]-\frac{2}{13} + (-9\frac{27}{44}) = -9\frac{439}{572}[/tex]