Question

771. BBINOTHATe heKcTBHA: 1
7
15
II
14
) (58) (12) -3.5;
2) 4+1 -1,
3) 2등:3+21:9-88:9
4) 2+(
11) : 1:1,
8
3
510

Answer 1

771. Выполните действия:

$1)(5 \frac{1}{2} \times 8) \times ( \frac{2}{3} \times 12) - 3 \frac{3}{5} \times 5 = ( \frac{11}{2} \times 8) \times (2 \times 4) - \frac{18}{5} \times 5 = (11 \times 4) \times 8 - 18 = 44 \times 8 - 18 = 352 - 18 = 334$

$2)4 \frac{2}{3} + \frac{7}{15} \times 1 \frac{11}{14} - 1 \frac{1}{5} = \frac{14}{3} + \frac{7}{15} \times \frac{25}{14} - \frac{6}{5} = \frac{14}{3} + \frac{1}{3} \times \frac{5}{2} - \frac{6}{5} = \frac{14}{3} + \frac{5}{6} - \frac{6}{5} = \frac{43}{10}$

$3)2 \frac{5}{8} \div 3 + 2 \frac{1}{4} \div 9 - 3 \frac{3}{4} \div 9 = \frac{21}{8} \times \frac{1}{3} + \frac{9}{4} \times \frac{1}{9} - \frac{15}{4} \times \frac{1}{9} = \frac{7}{8} + \frac{1}{4} - \frac{5} {4} \times \frac{1}{3} = \frac{7}{8} + \frac{1}{4} - \frac{5}{12} = \frac{17}{24}$

$4)2 \frac{1}{12} + (1 \frac{3}{8} - 1 \frac{1}{12} ) \div 1 \frac{2}{5} - \frac{3}{10} \div 1\frac{1}{5} = \frac{25}{12} + ( \frac{11}{8} - \frac{13}{12} ) \div \frac{7}{5} - \frac{3}{10} \div \frac{6}{5} = \frac{25}{12} + \frac{7}{24} \times \frac{5}{7} - \frac{3}{10} \times \frac{5}{6} = \frac{25}{12} + \frac{1}{24} \times 5 - \frac{1}{2} \times \frac{1}{2} = \frac{25}{12} + \frac{5}{24} - \frac{1}{4} = \frac{49}{24}$