Чему равно значение выражения:
1) $18\frac{5}{12} - \frac{7}{12} * 1\frac{19}{21} - \frac{17}{72} * \frac{2}{3}$;
2) $(6\frac{3}{4} - 5\frac{1}{8} : 1\frac{9}{32}) * \frac{5}{11}$;
3) (−1,42 − (−3,22)) : (−0,4) + (−6) * (−0,7);
4) $(-\frac{7}{18} + \frac{11}{12}) : (-\frac{19}{48})$;
5) $(-3\frac{1}{12} - 2\frac{1}{15}) : (-5\frac{3}{20})$?
$18\frac{5}{12} - \frac{7}{12} * 1\frac{19}{21} - \frac{17}{72} * \frac{2}{3} = 18\frac{5}{12} - \frac{7}{12} * \frac{40}{21} - \frac{17}{36} * \frac{1}{3} = 18\frac{5}{12} - \frac{1}{3} * \frac{10}{3} - \frac{17}{108} = 18\frac{5}{12} - 1\frac{1}{9} - \frac{17}{108} = 18\frac{45}{108} - 1\frac{12}{108} - \frac{17}{108} = 17\frac{16}{108} = 17\frac{4}{27}$
$(6\frac{3}{4} - 5\frac{1}{8} : 1\frac{9}{32}) * \frac{5}{11} = (6\frac{3}{4} - \frac{41}{8} : \frac{41}{32}) * \frac{5}{11} = (6\frac{3}{4} - \frac{41}{8} * \frac{32}{41}) * \frac{5}{11} = (6\frac{3}{4} - \frac{1}{1} * \frac{4}{1}) * \frac{5}{11} = 2\frac{3}{4} * \frac{5}{11} = \frac{11}{4} * \frac{5}{11} = \frac{5}{4} = 1\frac{1}{4}$
(−1,42 − (−3,22)) : (−0,4) + (−6) * (−0,7) = 1,8 : (−0,4) + 4,2 = −4,5 + 4,2 = −0,3
$(-\frac{7}{18} + \frac{11}{12}) : (-\frac{19}{48}) = (-\frac{14}{36} + \frac{33}{36}) * (-\frac{48}{19}) = \frac{19}{36} * (-\frac{48}{19}) = \frac{1}{3} * (-\frac{4}{1}) = -\frac{4}{3} = -1\frac{1}{3}$
$(-3\frac{1}{12} - 2\frac{1}{15}) : (-5\frac{3}{20}) = (-3\frac{5}{60} - 2\frac{4}{60}) : (-\frac{103}{20}) = (-5\frac{3}{20}) * (-\frac{20}{103}) = (-\frac{103}{20}) * (-\frac{20}{103}) = 1$
Пожауйста, оцените решение
