Question

Выполните действие : а) 1/4+1/5 б)1/3+1/7 в)3/5+3/4 г)1/2+7/9 д)5/7+0 е) 2/3-2/5 ж)1/2-1/3 з)3/5-4/7 и)5/7-1/6 к)8/9-0 л)3/4+4/5 м)3/4+2/9

Answer 1

$(\frac{1}{4})^{*5} +(\frac{1}{5})^{*4}= \frac{5}{20} +\frac{4}{20}= \frac{9}{20}$

$(\frac{1}{3})^{*7} +(\frac{1}{7})^{*3}= \frac{7}{21} +\frac{3}{21}= \frac{10}{21}$

$(\frac{3}{5})^{*4} +(\frac{3}{4})^{*5}= \frac{12}{20} +\frac{15}{20}= \frac{27}{20}=1\frac{7}{20}$

$(\frac{1}{2})^{*9} +(\frac{7}{9})^{*2}= \frac{9}{18} +\frac{14}{18}= \frac{23}{18}=1\frac{5}{18}$

$\frac{5}{7}+0=\frac{5}{7}$

$(\frac{2}{3})^{*5} -(\frac{2}{5})^{*3}= \frac{10}{15}-\frac{6}{15}= \frac{4}{15}$

$(\frac{1}{2})^{*3} -(\frac{1}{3})^{*2}= \frac{3}{6} -\frac{2}{6}= \frac{1}{6}$

$(\frac{3}{5})^{*7}-(\frac{4}{7})^{*5}= \frac{21}{35}-\frac{20}{35}= \frac{1}{35}$

$(\frac{5}{7})^{*6}-(\frac{1}{6})^{*7}= \frac{30}{42} -\frac{7}{42}= \frac{23}{42}$

$\frac{8}{9}-0=\frac{8}{9}$

$(\frac{3}{4})^{*5} +(\frac{4}{5})^{*4}= \frac{15}{20} +\frac{16}{20}= \frac{31}{20}=1\frac{11}{20}$

$(\frac{3}{4})^{*9} +(\frac{2}{9})^{*4}= \frac{27}{36} +\frac{8}{36}= \frac{35}{36}$