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

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

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

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

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

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

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

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

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

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

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

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

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