`3 -5/6×2/9= 3- 10/54= 3- 5/27= 81/27 - 5/27= 76/27`
`2/7:2/3×2= 2/7 xx 3/2 xx 2=6/14 xx 2= 12/14= 6/7`
`3-12/15:2= 3- 12/15 xx 1/2= 3- 12/30= 3- 2/5= 15/5 - 2/5= 13/5`
` 5/7:4-1/7= 5/7 xx 1/4 - 1/7= 5/28 - 1/7= 5/28- 4/28= 1/28`
\(3-\dfrac{5}{6}\times\dfrac{2}{9}=3-\dfrac{10}{54}=3-\dfrac{5}{27}=\dfrac{76}{27};\dfrac{2}{7}:\dfrac{2}{3}\times2=\dfrac{2}{7}\times\dfrac{3}{2}\times2=\dfrac{6}{14}\times2=\dfrac{12}{14}=\dfrac{6}{7};3-\dfrac{12}{15}:2=3-\dfrac{12}{15}\times\dfrac{1}{2}=3-\dfrac{12}{30}=3-\dfrac{2}{5}=\dfrac{15}{5}-\dfrac{2}{5}=\dfrac{13}{5};\dfrac{5}{7}:3-\dfrac{1}{7}=\dfrac{5}{7}\times\dfrac{1}{4}-\dfrac{1}{7}=\dfrac{5}{28}-\dfrac{1}{7}=\dfrac{5}{28}-\dfrac{4}{28}=\dfrac{1}{28}\)
