Предварительно сократив дроби , найдите значение выражения12. 14----. +. ---; 27. 2114. 15----. - ----24. 4012. 5---. - ----18. 604. 3---. +. ----24. 36

1) = 4/9+2/3=4/9+6/9=10/9=1 1/9 2) = 7/12-3/8=14/24-9/24=5/24 3) = 2/3-1/12=8/12-1/12=7/12 4) = 1/6+1/12= 2/12+1/12 = 3/12=1/4

[latex] \frac{12}{27}+ \frac{14}{21}= \frac{4}{9}+ \frac{2}{3}= \frac{4+6}{9}= \frac{10}{9} =1 \frac{1}{9} [/latex] [latex] \frac{14}{24}- \frac{15}{40} = \frac{7}{12} - \frac{3}{8}= \frac{14-9}{24}=\frac{5}{24} [/latex] [latex] \frac{12}{18}- \frac{5}{60}= \frac{2}{3} - \frac{1}{12}=\frac{8-1}{12}=\frac{7}{12}[/latex] [latex] \frac{4}{24}+ \frac{3}{36}= \frac{1}{6}+ \frac{1}{12}= \frac{2+1}{12} = \frac{3}{12}= \frac{1}{4} [/latex]