Question

Tính giá trị của biểu thức sau đây bằng cách hợp lý nhất: 

4/6+7/13+17/9+19/3+1/9+14/6

toán nâng cao hok bt lm:)

Answer 1

\(=\left(\dfrac{4}{6}+\dfrac{14}{6}\right)+\left(\dfrac{17}{9}+\dfrac{1}{9}\right)+\dfrac{19}{3}+\dfrac{7}{13}\)

=20/6+19/3+2+7/13

=29/3+2+7/13

=476/39

Answer 2

`4/6 + 7/13 + 17/9 + 19/3 +1/9 + 14/6`

`=2/3 + 7/13 + 17/9 + 19/3 +1/9 + 7/3`

` = (2/3 + 7/3) + ( 17/9 + 1/9) + 7/13 + 19/3`

` = 9/3 + 18/9 + 7/13 + 19/3`

`= 3 + 2 + 7/13 + 19/3`

`= 5 + 7/13 + 19/3`

`=72/13+19/3`

`=463/39`