Question

help me, thenk kiu

Answer 1

5

Answer 2

5

Answer 3

15/21 = 5/7 nhé

Answer 4

5 

Answer 5

5

Answer 6

5

Answer 7

5

Answer 8

5

Answer 9

\(\dfrac{15}{21}=\dfrac{...}{7}\Rightarrow\dfrac{7\times15}{21}=\dfrac{105}{21}=5\)

Answer 10

5