Verified answer

a) Ответ: 5

[tex](2 \frac{7}{12} - 1 \frac{11}{18} ) \times 1.44 - 0.4 = ( \frac{31}{12} - \frac{29}{18} ) \times 1 \frac{11}{25} - \frac{2}{5} = \frac{93 - 58}{36} \times \frac{36}{25} - \frac{2}{5} = \frac{35}{36} \times \frac{36}{25} - \frac{2}{5} = \frac{7}{5} - \frac{2}{5} = \frac{5}{5} = 1[/tex]

б) Ответ: 0,2

[tex]43 \div 21.5 - 1.5 \times 1.2 = 2 - 1.8 = 0.2[/tex]

в) Ответ: 8,2

[tex]8 \frac{1}{5} + \frac{3}{4} \times (2 \frac{1}{5} - 3 \frac{1}{3} ) = \frac{41}{5} + \frac{3}{4} \times ( \frac{11}{5} - \frac{10}{3} ) = \frac{41}{5} + \frac{3}{4} \times \frac{33 - 50}{15} = \frac{41}{5} + \frac{3}{4} \times ( - \frac{17}{15} ) = \frac{41}{5} - \frac{17}{20} = \frac{164 - 17}{20} = \frac{147}{20} = 8 \frac{4}{20} = 8 \frac{1}{5} = 8.2[/tex]