2 вариант: 1) (9,2/5) : 3; 2) 1/(1/18 − 1/21); 3) 1 8/17 : (12/17 + 2 7/11); 4) (14/11 + 17/10) · 11/15; 5) 10 · (1/5)^2 − 12 · 1/5; 6) 9,4/(4,1 + 5,3); 7) 21/(0,6 · 2,8); 8) 5,4 · 0,8 + 0,08; 9) 4,9 − 9,4; 10) 3 · 10^(−1) + 1 · 10^(−2) + 5 · 10^(−4); 11) 80 + 0,9 · (−10)^3.

Question

Вопрос:

Accepted Answer

\(\frac{9.2}{5}:3=\frac{9.2}{15}=0.613\frac13\).
\(\frac1{\frac1{18}-\frac1{21}}=\frac1{\frac{21-18}{378}}=\frac1{\frac1{126}}=126\).
\(1\frac8{17}:\left(\frac{12}{17}+2\frac7{11}\right)=\frac{25}{17}:\left(\frac{12}{17}+\frac{29}{11}\right)=\frac{25}{17}:\frac{625}{187}=\frac{11}{25}\).
\(\left(\frac{14}{11}+\frac{17}{10}\right)\cdot\frac{11}{15}=\frac{357}{110}\cdot\frac{11}{15}=\frac{119}{50}=2.38\).
\(10\cdot\left(\frac15\right)^2-12\cdot\frac15=\frac25-\frac{12}5=-2\).
\(\frac{9.4}{4.1+5.3}=\frac{9.4}{9.4}=1\).
\(\frac{21}{0.6\cdot2.8}=\frac{21}{1.68}=12.5\).
\(5.4\cdot0.8+0.08=4.32+0.08=4.4\).
\(4.9-9.4=-4.5\).
\(3\cdot10^{-1}+1\cdot10^{-2}+5\cdot10^{-4}=0.3+0.01+0.0005=0.3105\).
\(80+0.9\cdot(-10)^3=80-900=-820\).

Ответ: 1) 0,613(3); 2) 126; 3) 11/25; 4) 2,38; 5) −2; 6) 1; 7) 12,5; 8) 4,4; 9) −4,5; 10) 0,3105; 11) −820.