Question

15/21 - 2/7 =

trình bày cách tính nha

Answer 1

= 15/21 - 6/21

= 9/21

= 3/7

Answer 2

\(\dfrac{15}{21}-\dfrac{2}{7}=\dfrac{15-6}{21}=\dfrac{9}{21}=\dfrac{3}{7}\)

Answer 3

9/21 = 3/7

Answer 4

3/7

Answer 5

= 15/21 - 6/21 = 9/21 = 3/7

Answer 6

3/7

Answer 7

=5/7-2/7=3/7

Answer 8

3/7

Answer 9

= 15/21 - 6/21 = 9/21 = 3/7

Answer 10

\(\dfrac{15}{21}\) - \(\dfrac{2}{7}\) = \(\dfrac{105}{147}\) - \(\dfrac{42}{147}\)  = \(\dfrac{63}{147}\) 

 

\(\dfrac{105}{147}\) = \(\dfrac{15X7}{21X7}\)

 

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