( 7/4+5/4) x 5/3= 12/4 x 5/3 = 3 x 5/3= 5

5

5

=2/3+2/3=4/3

\(\dfrac{2}{3}+\dfrac{4}{5}\times\dfrac{5}{6}=\dfrac{2}{3}+\dfrac{2}{3}=\dfrac{4}{3}\)

88/99 = 88 : 11/ 99 : 11 = 8/9

3/15 chia cả mẫu cả tử cho 3 được 1/5+2/5=3/5 nhé

`5/3 + 1/5 : 3/4`

`= 5/3 + 1/5 xx 4/3`

`= 5/3 + 4/15`

`= 25/15 +4/15`

`= 29/15`

5/3 + 1/5 : 3/4

= 5/3 + 1/5 x 4/3

= 5/3 + 4/15

= 25/15 + 4/15

=29/15

\(=\dfrac{2}{3}\times\left(\dfrac{4}{10}+\dfrac{1}{5}\right)\\ =\dfrac{2}{3}\times\dfrac{3}{5}=\dfrac{2}{5}\)

\(\dfrac{2}{3}\times\left(\dfrac{4}{10}+\dfrac{1}{5}\right)=\dfrac{2}{3}\times\left(\dfrac{4}{10}+\dfrac{2}{10}\right)=\dfrac{2}{3}\times\dfrac{6}{10}=\dfrac{2}{3}\times\dfrac{3}{5}=\dfrac{6}{15}=\dfrac{2}{5}\)

2/5

\(=\dfrac{1}{12}\cdot5=\dfrac{5}{12}\)

1/60

\(\dfrac{1}{3}\times\dfrac{1}{4}\times\dfrac{1}{5}=\dfrac{1}{60}\)

1/3.1/4.1/5

=1/12.1/5

=1/60

\(x=\dfrac{4}{7}:\dfrac{3}{5}=\dfrac{4\times5}{7\times3}=\dfrac{20}{21}\)

=>x=4/7:3/5

x=4/7 x 5/3

x=20/21

\(\dfrac{3}{5}\times x=\dfrac{4}{7}\\ x=\dfrac{4}{7}:\dfrac{3}{5}\\ x=\dfrac{4}{7}\times\dfrac{5}{3}\\ x=\dfrac{20}{21}\)