1 вариант: 1) 1/4 + 0,7; 2) 0,9/(1 + 1/8); 3) (2 3/4 + 2 1/5) · 16; 4) (19/8 + 11/12) : 5/48; 5) 18 · (1/9)^2 − 20 · 1/9; 6) 2,4/(2,9 − 1,4); 7) (4,8 · 0,4)/0,6; 8) 30 − 0,8 · (−10)^2; 9) 5,7 − 7,6; 10) 30 · (−0,1)^3 + 7 · (−0,1)^2 − 3,9; 11) 0,6 · (−10)^3 + 50.

Question

Вопрос:

Accepted Answer

\(\frac14+0.7=0.25+0.7=0.95\).
\(\frac{0.9}{1+\frac18}=\frac{0.9}{\frac98}=0.9\cdot\frac89=0.8\).
\(\left(2\frac34+2\frac15\right)\cdot16=\left(\frac{11}4+\frac{11}5\right)\cdot16=\frac{99}{20}\cdot16=79.2\).
\(\left(\frac{19}8+\frac{11}{12}\right):\frac5{48}=\frac{79}{24}\cdot\frac{48}5=\frac{158}5=31.6\).
\(18\cdot\left(\frac19\right)^2-20\cdot\frac19=\frac29-\frac{20}9=-2\).
\(\frac{2.4}{2.9-1.4}=\frac{2.4}{1.5}=1.6\).
\(\frac{4.8\cdot0.4}{0.6}=\frac{1.92}{0.6}=3.2\).
\(30-0.8\cdot(-10)^2=30-0.8\cdot100=-50\).
\(5.7-7.6=-1.9\).
\(30\cdot(-0.1)^3+7\cdot(-0.1)^2-3.9=-0.03+0.07-3.9=-3.86\).
\(0.6\cdot(-10)^3+50=-600+50=-550\).

Ответ: 1) 0,95; 2) 0,8; 3) 79,2; 4) 31,6; 5) −2; 6) 1,6; 7) 3,2; 8) −50; 9) −1,9; 10) −3,86; 11) −550.