5. Вычислите: 1) 0,3 · 3,5² − 3,7; 2) 3/4 : 9 + (0,732 − 0,75) : 0,009; 3) 2 4/13 : (−15/26) − 3,75 · 2; 4) 481,92 : 12 − 25,16; 5) 2 11/17 · 2 4/15 − (13,7 · 1,5 − 21,55); 6) (3/20 + 4 1/15) + 25/42 · 2,1.

1. \(0.3\cdot3.5^2-3.7=0.3\cdot12.25-3.7=3.675-3.7=-0.025\).
2. \(\frac34:9+(0.732-0.75):0.009=\frac1{12}-0.018:0.009=\frac1{12}-2=-\frac{23}{12}\).
3. \(2\frac4{13}:\left(-\frac{15}{26}\right)-3.75\cdot2=\frac{30}{13}\cdot\left(-\frac{26}{15}\right)-7.5=-4-7.5=-11.5\).
4. \(481.92:12-25.16=40.16-25.16=15\).
5. \(2\frac{11}{17}\cdot2\frac4{15}-(13.7\cdot1.5-21.55)=\frac{45}{17}\cdot\frac{34}{15}-(20.55-21.55)=6-(-1)=7\).
6. \(\left(\frac3{20}+4\frac1{15}\right)+\frac{25}{42}\cdot2.1=\frac{53}{12}+\frac54=\frac{68}{12}=\frac{17}{3}\).

Ответ: 1) −0,025; 2) −23/12; 3) −11,5; 4) 15; 5) 7; 6) 17/3.