Question

а)(18/25+3/5)•25/33 б)3/8•5*4 1/6•2 1/10-9/20•6

Ответьте как можно побыстрее, умоляю

Answer 1

Ответ:

$a) (\frac{18}{25} + \frac{3}{5} ) \times \frac{25}{33} = ( \frac{18 + 15}{25} ) \times \frac{25}{33} = \frac{33}{25} \times \frac{25}{33} = \frac{33 \times 25}{25 \times 33} = 1$

$b) \frac{3}{8} \times 5 \times 4 \frac{1}{6} \times 2 \frac{1}{10} - \frac{9}{20} \times 6 = \frac{3}{8} \times 5 \times \frac{25}{6} \times \frac{21}{10} - \frac{9}{20} \times 6 = ( \frac{3}{8} \times \frac{25}{6} )(5 \times \frac{21}{10} ) - \frac{9 \times 6}{20} = (\frac{3 \times 25}{8 \times 6} )( \frac{5 \times 21}{10} ) - \frac{27}{10} = \frac{25}{14} \times \frac{21}{2} - \frac{27}{10} = \frac{25 - 147}{14} - \frac{27}{10} = - \frac{ 122}{14} - \frac{27}{10} = = - \frac{1220 - 378}{140} = \frac{842}{140} = \frac{421}{70} = 6 \frac{1}{7 0 }$