Question

Answer 1

\(\dfrac{13}{21}+13+\dfrac{8}{21}\\ =\left(\dfrac{13}{21}+\dfrac{8}{21}\right)\\ =\dfrac{21}{21}+13\\ =1+13\\ =14\)

Answer 2

\(=\left(\dfrac{13}{21}+\dfrac{8}{21}\right)+13=1+13=14\)

Answer 3

\(\dfrac{13}{21}+13+\dfrac{8}{21}\)

\(=13+\left(\dfrac{13}{21}+\dfrac{8}{21}\right)\)

\(=13+1\)

\(=14\)

Answer 4

14

Answer 5

(13/21+8/21)+ 13= 1+ 13 =14

Answer 6

= 14

Answer 7

kết quả bằng 14

Answer 8

bằng 14