Ответ:

[tex]4) -7\frac{3}{8} +4\frac{7}{10} = -7\frac{15}{40} +4\frac{28}{40} = -6\frac{55}{40} +4\frac{28}{40} = -2\frac{27}{40} \\ 5)-10+8\frac{7}{13} =-9\frac{13}{13} +8\frac{7}{13} =-1\frac{6}{13} \\ 6)7\frac{5}{9} +(-6\frac{11}{12} )=7\frac{20}{36} -6\frac{33}{36} =6\frac{56}{36} -6\frac{33}{36}=\frac{23}{36}\\ 7)-\frac{3}{4} +3,6 =-0,75+3,6=2,85\\ 8)2,05+(-3\frac{2}{5} )=2,05-3,4=-1,35\\ 9)-0,45+(-2\frac{1}{4} )=-0,45-2,25=-2,7\\[/tex]

[tex]12)2\frac{1}{6} +(-1,12)=2\frac{1}{6} -1\frac{12}{100} =2\frac{50}{300} -1\frac{36}{300} =1\frac{14}{300} =1\frac{7}{150}[/tex]