Question

помогите решить пожалуйста

Answer 1

Ответ:

Пошаговое объяснение:

5/24+3/8=( 5+9)/24=14/24=7/12

7/10-2/5= (7-4)/10= 3/10

7/9-5/7= (49-45)/63= 4/63

2/3+7/8= (16+21)/24= 37/24= 1 13/24

3/4-1/8 = (6-1)/8= 5/8

5/6+ 1/9=(15+2)/18= 17/18

Answer 2

Ответ: $\frac{7}{12} ;$ $\frac{3}{10}$ или 0,3; $\frac{4}{63}$; $1\frac{13}{24}$; $\frac{5}{8}$ или 0,625; $\frac{17}{18}$.

Пошаговое объяснение:

$\displaystyle \frac{5}{24} +\frac{3}{8} =\frac{5*1+3*3}{24} =\frac{5+9}{24} =\frac{14}{24} =\frac{7}{12}$

$\displaystyle \frac{7}{10} -\frac{2}{5} =\frac{7*1-2*2}{10} =\frac{7-4}{10} =\frac{3}{10} =0,3\\\\\displaystyle \frac{7}{9} -\frac{5}{7} =\frac{7*7-5*9}{63} =\frac{49-45}{63} =\frac{4}{63} \\\\\\\displaystyle \frac{2}{3} +\frac{7}{8} =\frac{2*8+7*3}{24} =\frac{16+21}{24} =\frac{37}{24} =1 \frac{13}{24} \\\\\\\displaystyle \frac{3}{4} -\frac{1}{8}= \frac{3*2-1*1}{8} =\frac{6-1}{8}= \frac{5}{8} =0,625\\\\\\displaystyle \frac{5}{6} +\frac{1}{9} =\frac{5*3+1*2}{18} =\frac{15+2}{18} =\frac{17}{18}$