Question

rút gọn p/số : a, 18/45 b,63/81 c,105/325 d,49/56

Answer 1

\(a.\dfrac{18}{45}=\dfrac{18:9}{45:9}=\dfrac{2}{5}\)

\(b,\dfrac{63}{81}=\dfrac{63:9}{81:9}=\dfrac{7}{9}\)

\(c,\dfrac{105}{325}=\dfrac{105:5}{325:5}=\dfrac{21}{65}\)

\(d,\dfrac{49}{56}=\dfrac{49:7}{56:7}=\dfrac{7}{8}\)

 

 

 

Answer 2

\(\dfrac{\text{18}}{45}=\dfrac{\text{18}:9}{45:9}=\dfrac{2}{5}\)

\(\dfrac{63}{81}=\dfrac{63:9}{81:9}=\dfrac{7}{9}\)

\(\dfrac{\text{105 }}{325}=\dfrac{\text{105 : 5}}{\text{325 : 5 }}=\dfrac{\text{21}}{\text{65 }}\)

\(\dfrac{\text{49}}{56}=\dfrac{\text{49}:7}{56:7}=\dfrac{7}{8}\)

Answer 3

a) \(\dfrac{18}{45}=\dfrac{18:18}{45:18}=\dfrac{2}{5}\)

b) \(\dfrac{63}{81}=\dfrac{63:63}{81:63}=\dfrac{7}{9}\)

c) \(\dfrac{105}{325}=\dfrac{105:105}{325:105}=\dfrac{21}{65}\)

d) \(\dfrac{49}{56}=\dfrac{49:49}{56:49}=\dfrac{7}{8}\)