Вариант 1, уровень 1: 1) 7/8 − 5/6 · 9/20; 2) 2/9 + 4/7 : 9/28; 3) 2 5/8 : 3/4 + 1/2; 4) −6,5 + 6,27 : 1,1; 5) (6,8 − 1,3) · 7,2; 6) (7,8 + 8,3) / 4,6.

Question

Вопрос:

Accepted Answer

\(\frac{7}{8}-\frac{5}{6}\cdot\frac{9}{20}=\frac{7}{8}-\frac{3}{8}=\frac{1}{2}\).
\(\frac{2}{9}+\frac{4}{7}:\frac{9}{28}=\frac{2}{9}+\frac{4}{7}\cdot\frac{28}{9}=\frac{2}{9}+\frac{16}{9}=2\).
\(2\frac{5}{8}:\frac{3}{4}+\frac{1}{2}=\frac{21}{8}\cdot\frac{4}{3}+\frac{1}{2}=\frac{7}{2}+\frac{1}{2}=4\).
\(-6.5+6.27:1.1=-6.5+5.7=-0.8\).
\((6.8-1.3)\cdot7.2=5.5\cdot7.2=39.6\).
\((7.8+8.3):4.6=16.1:4.6=3.5\).

Ответ: 1) \(\frac{1}{2}\); 2) 2; 3) 4; 4) −0,8; 5) 39,6; 6) 3,5.