Question

Thực hiện phép tính:

\(1\dfrac{7}{20}\):2,7+2,7:1,35+(0,4:\(2\dfrac{1}{2}\)).(4,2-\(1\dfrac{3}{40}\)^₎

Answer 1

 

1207​:2,7+2,7:1,35+(0,4:212221​).(4,2-13401403​^₎=

 

Answer 2

   \(1\dfrac{7}{20}\div2,7+2,7\div1,35+\left(0,4\div2\dfrac{1}{2}\right)\times\left(4,2-1\dfrac{3}{40}\right)\)

\(=\dfrac{27}{20}\div\dfrac{27}{10}+\dfrac{27}{10}\div\dfrac{27}{20}+\left(\dfrac{2}{5}\div\dfrac{5}{2}\right)\times\left(\dfrac{21}{5}-\dfrac{43}{40}\right)\)

\(=\dfrac{27}{20}\times\dfrac{10}{27}+\dfrac{27}{10}\times\dfrac{20}{27}+\left(\dfrac{2}{5}\times\dfrac{2}{5}\right)\times\dfrac{25}{8}\)

\(=\dfrac{1}{2}+2+\dfrac{4}{25}\times\dfrac{25}{8}\)

\(=\dfrac{5}{2}+\dfrac{1}{2}\)

\(=3\)