Question

3 12 ( 3 )-(-0,4 2)-(-0,49 – 0,81) - 5 8. Найдите значение выражения: - 14 7​

Answer 1

Ответ:

$( - \frac{1}{14} + \frac{3}{7} ) - ( - 0.49 - 0.81) - 1 \frac{12}{21} = -\frac{1}{14}+\frac{6}{14}-\left(-0.49-0.81\right)-\frac{1\times 21+12}{21} = \frac{-1+6}{14}-\left(-0.49-0.81\right)-\frac{1\times 21+12}{21} =\frac{5}{14}-\left(-0.49-0.81\right)-\frac{1\times 21+12}{21} =\frac{5}{14}-\left(-1.3\right)-\frac{1\times 21+12}{21} =\frac{5}{14}+1.3-\frac{1\times 21+12}{21} =\frac{5}{14}+\frac{13}{10}-\frac{1\times 21+12}{21} = \frac{25}{70}+\frac{91}{70}-\frac{1\times 21+12}{21} =\frac{25+91}{70}-\frac{1\times 21+12}{21} =\frac{116}{70}-\frac{1\times 21+12}{21} =\frac{58}{35}-\frac{1\times 21+12}{21} = \frac{58}{35}-\frac{21+12}{21} =\frac{58}{35}-\frac{33}{21} =\frac{58}{35}-\frac{11}{7} =\frac{58}{35}-\frac{55}{35} =\frac{58-55}{35} = \frac{3}{35}$