Question

Các bạn tính nhanh bài toán:
5/11 + 13/21 + 6/11 + 8/21

Answer 1

(5/11 + 6/11) + (13/21 + 8/21)
= 1 + 1
= 2

Answer 2

\(\dfrac{5}{11}+\dfrac{13}{21}+\dfrac{6}{11}+\dfrac{8}{21}\\ =\left(\dfrac{5}{11}+\dfrac{6}{11}\right)+\left(\dfrac{13}{21}+\dfrac{8}{21}\right)\\ =\dfrac{11}{11}+\dfrac{21}{21}\\ =1+1\\ =2\)

Answer 3

= (5/11 + 6/11) + (13/21 + 8/21)

=     1 + 1

= 2

Vậy giá trị biểu thức là 2