Question

2 3/4:(1 1/2-2/5)+(3/4+5/6)*6/19
По действиям ​

Answer 1

Ответ:

$\displaystyle2\frac{3}{4} :(1\frac{1}{2} -\frac{2}{5} )+(\frac{3}{4} +\frac{5}{6} )*\frac{6}{19} =3$

$1)\displaystyle1\frac{1}{2} -\frac{2}{5} =\frac{3}{2} -\frac{2}{5} =\frac{15}{10} -\frac{4}{10} =\frac{11}{10}$

$\displaystyle2)\frac{3}{4} +\frac{5}{6} =\frac{9}{12} +\frac{10}{12} =\frac{19}{12}$

$\displaystyle3)2\frac{3}{4} :\frac{11}{10} =\frac{11}{4} *\frac{10}{11} =\frac{1*5}{2*1} =\frac{5}{2}$

$4)\displaystyle\frac{19}{12} *\frac{6}{19} =\frac{1*1}{2*1} =\frac{1}{2}$

$5)\displaystyle\frac{5}{2} +\frac{1}{2} =\frac{6}{2} =3$

Answer 2

Ответ:

3

Пошаговое объяснение:

1) 1. 1/2 - 2/5 = 1. 5/10 - 4/10 = 1. 1/10

2) 2. 3/4 : 1. 1/10 = 11/4 : 11/10 = 11/4 * 10/11 = 1/2 *5/1 = 5/2 = 2. 1/2

3) 3/4 + 5/6 = 9/12 + 10/12 = 19/12

4) 19/12 * 6/19 = 1/2 * 1/1 = 1/2

5) 2. 1/2 + 1/2 = 2. 2/2 = 3