Question

Tính: 

1)4 -2,7-17,3

2)-11/24+(5/11-13/24)

3)-5/9+(8/15-4/9)+7/15

Answer 1

`1, 4 - 2,7 - 17,3`

`= 4 - (2,7 + 17,3)`

`= 4 -20`

`= -16`

`2, -11/24 + (5/11 - 13/24)`

`= -11/24 + 5/11 - 13/24`

`= (-11/24 - 13/24) + 5/11`

`= -1 + 5/11`

`= -6/11`

`c, -5/9+ (8/15-4/9)+ 7/15`

`= -5/9+ 8/15 - 4/9 + 7/15`

`= (-5/9 -  4/9) + (8/15 + 7/15)`

`= -1 + 1`

`= 0`

Answer 2

1: \(4-2,7-17,3\)

=4-20

=-16

2: \(-\dfrac{11}{24}+\left(\dfrac{5}{11}-\dfrac{13}{24}\right)=-\dfrac{11}{24}+\dfrac{5}{11}-\dfrac{13}{24}\)

\(=\dfrac{5}{11}-1=-\dfrac{6}{11}\)

3: \(-\dfrac{5}{9}+\left(\dfrac{8}{15}-\dfrac{4}{9}\right)+\dfrac{7}{15}\)

\(=-\dfrac{5}{9}-\dfrac{4}{9}+\dfrac{8}{15}+\dfrac{7}{15}\)

=-1+1=0

Answer 3

`1.` `4 - 2,7 - 17,3`

`= 4 - 20`

`= -16`

``

`2.` `-11/24 + (5/11 - 13/24)`

`= -11/24 + 5/11 - 13/24`

`= (-11/24 - 13/24) + 5/11`

`= -1 + 5/11`

`= -6/11`

``

`3.` `-5/9 + (8/15 - 4/9) + 7/15`

`= -5/9 + 8/15 - 4/9 + 7/15`

`= (-5/9 - 4/9) + (8/15 + 7/15)`

`= -1 + 1`

`=0`