Ответ:

а) \(8\frac7{12}-2\frac{17}{36}=\frac{55}{9}\); \(\frac{55}{9}\cdot2.7=16.5\); \(4\frac13:0.65=\frac{20}{3}\). Поэтому \(16.5-\frac{20}{3}=\frac{59}{6}\).

б) \(1\frac{11}{24}+\frac{13}{36}=\frac{131}{72}\); \(\frac{131}{72}\cdot1.44=\frac{131}{50}\); \(\frac8{15}\cdot0.5625=\frac3{10}\). Поэтому \(\frac{131}{50}-\frac3{10}=\frac{58}{25}=2.32\).

в) \(6\frac8{15}-4\frac{21}{45}=\frac{31}{15}\); \(\frac{31}{15}\cdot4.5=\frac{93}{10}\); \(2\frac16:0.52=\frac{25}{6}\). Поэтому \(\frac{93}{10}-\frac{25}{6}=\frac{77}{15}\).

г) \(\frac9{22}+1\frac{12}{33}=\frac{39}{22}\); \(\frac{39}{22}\cdot1.32=\frac{117}{50}\); \(\frac8{13}\cdot0.1625=\frac1{10}\). Поэтому \(\frac{117}{50}-\frac1{10}=\frac{56}{25}=2.24\).

Ответ: а) \(\frac{59}{6}\); б) 2,32; в) \(\frac{77}{15}\); г) 2,24.