Question

ПОМОГИТЕ ПОЖАЛУЙСТА ​

Answer 1

Ответ:

$\frac{3}{5} +\frac{1}{5}=\frac{4}{5}$

$\frac{2}{7} +\frac{1}{3} =\frac{6+7}{21}=\frac{13}{21}$

$\frac{3}{4}+ \frac{5}{12} =\frac{9+5}{12} =\frac{14}{12}=1\frac{2}{12} =1\frac{1}{6}$

$\frac{2}{25} +\frac{1}{20} =\frac{8+5}{100} =\frac{13}{100} =0,13$

$\frac{3}{7} -\frac{2}{7} =\frac{1}{7}$

$\frac{11}{12}- \frac{2}{3} =\frac{11-8}{12} =\frac{3}{12}=\frac{1}{4}$

$\frac{2}{3} -\frac{5}{9}= \frac{6-5}{9} =\frac{1}{9}$

$\frac{5}{21}- \frac{3}{14}= \frac{10-9}{42}= \frac{1}{42}$

2)

$\frac{2}{15}+ (\frac{1}{15} +\frac{1}{3})=\frac{2}{15}+\frac{1+5}{15} =\frac{17}{15} =1\frac{2}{15}$

$\frac{1}{20}+ \frac{2}{15}+ \frac{3}{20}+ \frac{1}{15} =\frac{4}{20}+\frac{3}{15} =\frac{1}{5}+\frac{1}{5} =\frac{2}{5}$

$\frac{2}{4} +\frac{2}{3}-\frac{17}{12} =\frac{6+8-17}{12}=\frac{14-17}{12}=-\frac{3}{12}=-\frac{1}{4} =-0,25$