Question

Tính.

a) \(\dfrac{3}{22}\times\dfrac{3}{11}\times22\)                           b) \(\left(\dfrac{1}{3}+\dfrac{1}{6}\right)\times\dfrac{2}{5}\)

Answer 1

a) \(\dfrac{3}{22}\times\dfrac{3}{11}\times22\)

\(=\dfrac{3}{22}\times\dfrac{3}{11}\times\dfrac{22}{1}\)

\(=\dfrac{3\times3\times22}{22\times11\times1}\)

\(=\dfrac{9}{11}\)

b) \(\left(\dfrac{1}{3}+\dfrac{1}{6}\right)\times\dfrac{2}{5}\)

\(=\left(\dfrac{2}{6}+\dfrac{1}{6}\right)\times\dfrac{2}{5}\)

\(=\dfrac{3}{6}\times\dfrac{2}{5}\)

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

\(=\dfrac{2}{10}\)

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

Answer 2

a: =3/22*22*3/11

=3*3/11

=9/11

b: =(2/6+1/6)*2/5

=1/2*2/5

=1/5