- \((-4.8+3)\cdot\frac13+6=-1.8\cdot\frac13+6=5.4\).
- \((5\frac23+\frac13)\cdot0.2+6=6\cdot0.2+6=7.2\).
- \((6\frac23-\frac13)\cdot2.5+6=6\frac13\cdot2.5+6=21\frac56\).
- \((-2.8+3.7)\cdot\frac13+6=0.9\cdot\frac13+6=6.3\).
- \((5.7+\frac3{10})\cdot1.2+6=6\cdot1.2+6=13.2\).
- \(4\frac3{14}-(3-2\frac9{14}):\frac75+\frac17=\frac{30}{7}-\frac{5}{14}\cdot\frac57+\frac17=\frac{209}{49}\).
- \(2\frac38-(2-1\frac35):\frac45+\frac78=\frac{19}{8}-\frac25\cdot\frac54+\frac78=\frac{21}{8}=2\frac58\).
- \(7\frac34-(5-2\frac3{11}):\frac{15}{22}+\frac18=\frac{31}{4}-\frac{30}{11}\cdot\frac{22}{15}+\frac18=\frac{65}{8}=8\frac18\).
- \(1.2-3.6:(-1.2)=1.2-(-3)=4.2\).
- \(1.2-\frac23:\frac29=1.2-3=-1.8\).
- \(1.2-0.6:(-20)=1.2+0.03=1.23\).
- \(1.2-1\frac17:(-\frac{30}{77})=1.2+\frac87\cdot\frac{77}{30}=1.2+\frac{44}{15}=\frac{62}{15}=4\frac2{15}\).
- \(1.2-4\frac1{10}:20.5=1.2-\frac{41}{10}\cdot\frac2{41}=0.4\).
- \(4:\frac{20}{21}+3\frac15\cdot(\frac34-1\frac3{16})=\frac{21}{5}+\frac{16}{5}\cdot(-\frac7{16})=\frac75=1.4\).
- \(3\cdot\frac{15}{16}+1\frac25\cdot(\frac56-1\frac{11}{42})=\frac{45}{16}+\frac75\cdot(-\frac37)=\frac{213}{80}=2\frac{53}{80}\).
- \(6:\frac{18}{19}+2\frac16\cdot(\frac78-3\frac3{104})=\frac{19}{3}+\frac{13}{6}\cdot(-\frac{53}{104})=\frac{237}{52}=4\frac{29}{52}\).
Ответ: 5,4; 7,2; 21 5/6; 6,3; 13,2; 209/49; 2 5/8; 8 1/8; 4,2; −1,8; 1,23; 4 2/15; 0,4; 1,4; 2 53/80; 4 29/52.