Question

thuận tiện :
\(4\dfrac5{11} + 2\dfrac9{13} + 3\dfrac6{11} + 4\dfrac4{13}\)
 

Answer 1

`4 5/11+2 9/13+3 6/11+4 4/13`

`= 49/11+35/13+39/11+56/13`

`= (49/11+39/11)+(35/13+56/13)`

`= 88/11+91/13`

`= 8+7`

`= 15`

Answer 2

`4 5/11 + 2 9/13 + 3 6/11 + 4 4/13`

`=(4 5/11 + 3 6/11)+(2 9/13 + 4 4/13)`

`=7 11/11 + 6 13/13`

`=8+7=15`

Answer 3

= 49/11 + 35/13 + 39/11 + 56/13

= ( 49/11 + 39/11) + (35/13 + 56/13)

= 88/11 + 91/13

= ...

Answer 4

\(=\dfrac{49}{11}+\dfrac{35}{13}+\dfrac{39}{11}+\dfrac{56}{13}=\left(\dfrac{49}{11}+\dfrac{39}{11}\right)+\left(\dfrac{35}{13}+\dfrac{56}{13}\right)=8+7=15\)