Question

Bài 1: Rút gọn các phân số

14/28 , 33/99 , 12/80 ,  50/150 , 45/9 ,   81/72 , 34/68 , 

Answer 1

\(\dfrac{14}{28}=\dfrac{14:14}{28:14}=\dfrac{1}{2}\)

\(\dfrac{33}{99}=\dfrac{33:33}{99:33}=\dfrac{1}{3}\)

\(\dfrac{12}{80}=\dfrac{12:4}{80:4}=\dfrac{3}{20}\)

\(\dfrac{50}{150}=\dfrac{50:50}{150:50}=\dfrac{1}{3}\)

\(\dfrac{45}{9}=\dfrac{45:9}{9:9}=5\)

\(\dfrac{81}{72}=\dfrac{81:9}{72:9}=\dfrac{9}{8}\)

\(\dfrac{34}{68}=\dfrac{34:34}{68:34}=\dfrac{1}{2}\)

Answer 2

14/28=1/2

33/99=1/3

12/80=3/20

50/150=1/3

45/9=5

81/72=9/8

34/68=1/2

Answer 3

\(\dfrac{14}{28}=\dfrac{1}{2};\dfrac{33}{99}=\dfrac{11}{33};\dfrac{12}{80}=\dfrac{3}{20};\dfrac{50}{150}=\dfrac{1}{3};\dfrac{45}{9}=5;\dfrac{81}{72}=\dfrac{9}{8};\dfrac{34}{68}=\dfrac{1}{2}\)