Question

quy đồng ba phân số sau 3/5 2/20 7/10

Answer 1

\(\dfrac{3}{5}=\dfrac{3\times4}{5\times4}=\dfrac{12}{20}\)

\(\dfrac{2}{20}\) giữ nguyên

\(\dfrac{7}{10}=\dfrac{7\times2}{10\times2}=\dfrac{14}{20}\)

Answer 2

3/5=(3*4)/(5*4)=12/20

2/20=2/20

7/10=(7*2)/(10*2)=14/20

Answer 3

3/5=(3x4)/(5x4)=12/20

2/20= giữ nguyên

7/10=(7x2)/(10x2)=14/20

Answer 4

4 - 15/7 =??