Question

[trinh nam khanh]

tinh bang hai cach

3/22 x 3/11 x 22

[1/2 + 1/3] x 2/5

Answer 1

[Bùi Quang Anh]

\(\frac{3}{22}\times\frac{3}{11}\times22\)

1.\(=\frac{3\times3\times22}{22\times11\times1}\)

\(=\frac{3\times3}{11\times1}\)

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

2.  \(=\frac{9}{242}\times22\)

\(=\frac{198}{242}\)

\(=\frac{9\times2\times11}{2\times11\times11}\)

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

\(\left(\frac{1}{2}+\frac{1}{3}\right)\times\frac{2}{5}\)

1.\(=\frac{5}{6}\times\frac{2}{5}\)

\(=\frac{5\times2}{3\times2\times5}\)

\(=\frac{1}{3}\)

2.\(\)\(=\frac{1}{2}\times\frac{2}{5}+\frac{1}{3}\times\frac{2}{5}\)

\(=\frac{1}{5}+\frac{2}{15}\)

\(=\frac{3}{15}+\frac{2}{15}\)

\(=\frac{5}{15}=\frac{1}{3}\)

Have a good day