Question

а) (12 - 5 3/4) • 4/5

в) 2 2/3 : 1 7/9

б) 11 5/8 + 7 1/6

г) (4 1/5 - 2 3/4​

Answer 1

Ответ:

$(12 - 5 \frac{3}{4} ) \times \frac{4}{5} =( 12 - \frac{23}{4} ) \times \frac{4}{5} = ( \frac{48 - 23}{4} ) \times \frac{4}{5} = \frac{25}{4} \times \frac{4}{5} = 5$

$2 \frac{2}{3} \div 1 \frac{7}{9} = \frac{8}{3} \div \frac{16}{9} = \frac{8}{3} \times \frac{9}{16} = \frac{3}{2} = 1.5$

$11 \frac{5}{8} + 7 \frac{1}{6} = 18 \frac{15 + 4}{24} = 18 \frac{19}{24}$

$4 \frac{1}{5} - 2 \frac{3}{4} = \frac{21}{5} - \frac{11}{4} = \frac{84 - 55}{20} = \frac{29}{20} = 1.45$