Question

\(\frac{1}{6}+\frac{2}{15}+\frac{4}{15}+\frac{2}{99}+\frac{9}{220}+\frac{10}{600}\)

Answer 1

1/6 + 2/15 + 4/15 + 2/99 + 9/220 + 10/600

=( 1/6 + 1/60) + (2/15 + 4/15) + 2/99 + 9/220

=11/60 + 2/5 + 11/180

=7/12 + 11/180

=29/45

Answer 2

\(=\left(\frac{1}{6}+\frac{1}{60}\right)+\left(\frac{2}{15}+\frac{4}{15}\right)+\frac{2}{99}+\frac{9}{220}\)

\(=\frac{11}{60}+\frac{2}{5}+\frac{11}{180}=?\)

\(=\frac{7}{12}+\frac{11}{180}=?\)

\(=\frac{29}{45}.\)

Answer 3

1/6 + 2/15 + 4/15 + 2/99 + 9/220 + 10/600

= 1/6 + 2/15 + 4/15 + 2/99 + 9/220 + 1/60

= (1/6 + 1/60) + (2/15 + 4/15) + 2/99 + 9/220

= (10/60 + 1/60) + 2/5  + 2/99 + 9/220

= 11/60 + 2/5 + 2/99 + 9/220

= (11/60 + 2/5) + (2/99 + 9/220)

= (11/60 + 24/60) + 11/180

= 7/12 + 11/180

= 29/45

Answer 4

Theo đề bài ta có cách làm như sau:

 1/6 + 2/15 + 4/15 + 2/99 + 9/220 + 10/600

=1/6 + 2/15 + 4/15 + 2/99 + 9/220 + 1/60

=(1/6 + 1/60 )+(2/15 + 4/15 ) + 2/99 + 9/220

=11/60 + 2/5 + 11/180

= 7/12 + 11/180

= 29/45