Question

1.Hãy rút gọn phân số

a.6/9; 6/24; 48/96; 42/98.      b.24/36;18/30;15/120;80/240

Answer 1

a)

`6/9=2/3`

`6/24=1/4`

`48/96=1/2`

`42/98=3/7`

b)

`24/36=2/3`

`18/30=3/5`

`15/120=1/8`

`80/240=1/3`

Answer 2

a)\(\dfrac{6}{9}=\dfrac{6:3}{9:3}=\dfrac{2}{3}\)
\(\dfrac{6}{24}=\dfrac{6:6}{24:6}=\dfrac{1}{4}\)
\(\dfrac{48}{96}=\dfrac{48:48}{96:48}=\dfrac{1}{2}\)
\(\dfrac{42}{98}=\dfrac{42:14}{98:14}=\dfrac{3}{7}\)
b)\(\dfrac{24}{36}=\dfrac{24:12}{36:12}=\dfrac{2}{3}\)
\(\dfrac{18}{30}=\dfrac{18:6}{30:6}=\dfrac{3}{5}\)
\(\dfrac{15}{120}=\dfrac{15:15}{120:15}=\dfrac{1}{8}\)
\(\dfrac{80}{240}=\dfrac{80:80}{240:80}=\dfrac{1}{3}\)

Answer 3

\(a,\dfrac{6}{9}=\dfrac{2}{3};\dfrac{6}{24}=\dfrac{1}{4};\dfrac{48}{96}=\dfrac{1}{2};\dfrac{42}{98}=\dfrac{3}{7}\\ b,\dfrac{24}{36}=\dfrac{2}{3};\dfrac{18}{30}=\dfrac{3}{5};\dfrac{15}{120}=\dfrac{1}{8};\dfrac{80}{240}=\dfrac{1}{3}\)

Answer 4

\(a.\dfrac{6}{9}=\dfrac{2}{3};\dfrac{6}{24}=\dfrac{1}{4};\dfrac{48}{96}=\dfrac{1}{2};\dfrac{42}{98}=\dfrac{3}{7}\)

\(b,\dfrac{24}{36}=\dfrac{2}{3};\dfrac{18}{30}=\dfrac{3}{5};\dfrac{15}{120}=\dfrac{1}{8};\dfrac{80}{240}=\dfrac{1}{3}\)

Answer 5

\(a,\)

\(\dfrac{6}{9}=\dfrac{6:3}{9:3}=\dfrac{2}{3}\)

\(\dfrac{6}{24}=\dfrac{6:6}{24:6}=\dfrac{1}{4}\)

\(\dfrac{48}{96}=\dfrac{48:48}{96:48}=\dfrac{1}{2}\)

\(\dfrac{42}{98}=\dfrac{42:14}{98:14}=\dfrac{3}{7}\)

\(b,\)

\(\dfrac{24}{36}=\dfrac{24:12}{36:12}=\dfrac{2}{3}\)

\(\dfrac{18}{30}=\dfrac{18:6}{30:6}=\dfrac{3}{5}\)

\(\dfrac{15}{120}=\dfrac{15:15}{120:15}=\dfrac{1}{8}\)

\(\dfrac{80}{240}=\dfrac{80:80}{240:80}=\dfrac{1}{3}\)

Answer 6

\(a)\)

\(\dfrac{6}{9}=\dfrac{2}{3}\)

\(\dfrac{6}{24}=\dfrac{1}{4}\)

\(\dfrac{48}{96}=\dfrac{1}{2}\)

\(\dfrac{42}{98}=\dfrac{3}{7}\)

\(b)\)

\(\dfrac{24}{36}=\dfrac{2}{3}\)

\(\dfrac{18}{30}=\dfrac{3}{5}\)

\(\dfrac{15}{120}=\dfrac{1}{8}\)

\(\dfrac{80}{240}=\dfrac{1}{3}\)

Answer 7

a. 

\(\dfrac{6}{9}=\dfrac{2}{3};\dfrac{6}{24}=\dfrac{1}{4};\dfrac{48}{96}=\dfrac{1}{2};\dfrac{42}{98}=\dfrac{3}{7}\) 

b.

\(\dfrac{24}{36}=\dfrac{2}{3};\dfrac{18}{30}=\dfrac{3}{5};\dfrac{15}{120}=\dfrac{1}{8};\dfrac{80}{240}=\dfrac{1}{2}\)