15/25 + 5=28/5
3/2 - 4/8=1
2/9 x 5 =10/9
6/7 : 3/4=8/7
15/25 + 5 = 15/25 + 125/25 = 140/25 = 28/5
3/2 - 4/8 = 12/8 - 4/8 = 8/8 = 1
2/9 x 5 = 10/9
6/7 : 3/4 = 6/7 x 4/3 = 8/7
\(\dfrac{15}{25}+5=\dfrac{15}{25}+\dfrac{5}{1}=\dfrac{15}{25}+\dfrac{125}{25}=\dfrac{15+125}{25}=\dfrac{140}{25}=\dfrac{28}{5}\)
\(\dfrac{3}{2}-\dfrac{4}{8}=\dfrac{12}{8}-\dfrac{4}{8}=\dfrac{12-4}{8}=\dfrac{8}{8}=1\)
\(\dfrac{2}{9}x5=\dfrac{2x5}{9x1}=\dfrac{10}{9}\)
\(\dfrac{6}{7}:\dfrac{3}{4}=\dfrac{6x4}{7x3}=\dfrac{24}{21}=\dfrac{8}{7}\)