Question

Tính:

a) \(8\dfrac{7}{13}.5\dfrac{1}{4}+3\dfrac{14}{17}.5\dfrac{1}{4}\)

b) \(\dfrac{11}{25}.\left(-24,8\right)-\dfrac{11}{25}.75,2\)

Answer 1

`8 7/13 . 5 1/4 + 3 14/17 . 5 1/4`

`= 111/13 . 21/4 + 65/17 . 21/4`

`= 21/4 . (111/13 + 65/17)`

`= 21/4 . 2732/221`

`= 14343/221`

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`11/25 . (-24,8) - 11/25 . 75,2`

`= 11/25 . [(-24,8) - 75,2]`

`= 11/25 . (-100)`

`= -44`

Answer 2

`a)` Mik làm rồi bạn nhé!

`b)`\(\dfrac{11}{25}.\left(-24,8\right)-\dfrac{11}{25}.75,2\)

\(=\dfrac{11}{25}.\left(-24,8-75,2\right)\)

\(=\dfrac{11}{25}.-100\)

`=-44`