Question

3. Сначала сократив дроби, а потом приведя их к общему знаменателю вычеслите: а) 25/80 + 45/60; б) 36/300 + 12/40 - 350/1000; в) 42/120 + 20/32 - 28/160; г) 20/45 + 26/54; д) 14/24 - 39/90 + 15/100; е) 45/72 - 33/144 - 20/64; (Срочно, поскорее пж!)​

Answer 1

Ответ:

$\frac{25}{80} + \frac{45}{60} = \frac{5}{16} + \frac{3}{4} = \frac{5}{16} = \frac{5}{16} + \frac{12}{16} = \frac{17}{16} = 1 \frac{1}{16}$

$\frac{36}{300} + \frac{12}{40} - \frac{350}{1000} = \frac{3}{25} + \frac{3}{10} - \frac{7}{20} = \frac{12 + 30 - 35}{100} = \frac{7}{100}$

$\frac{42}{120} + \frac{20}{32} - \frac{28}{160} = \frac{7}{20} + \frac{5}{8} - \frac{7}{40} = \frac{14 + 25 - 7}{40} = \frac{32}{40} = \frac{4}{5}$

$\frac{14}{24} - \frac{39}{90} + \frac{15}{100} = \frac{7}{12} - \frac{13}{30} + \frac{3}{20} = = \frac{35 - 26 + 9}{60} = \frac{18}{60} = \frac{3}{10}$

$\frac{45}{72} - \frac{33}{144} - \frac{20}{64} = \frac{5}{8} - \frac{11}{48} - \frac{5}{16} = \frac{30 - 11 - 15}{48} = \frac{4}{48} = \frac{1}{12}$