Question

[bảo bảo]

Bài 1: Tính

a) \(\dfrac{7}{5}+3\dfrac{2}{5}-1\dfrac{1}{2}\)

b) 3 x 2\(\dfrac{4}{9}\)x\(\dfrac{3}{2}\)

c) \(\dfrac{5}{9}x\left(2\dfrac{1}{6}-1\dfrac{2}{3}\right)\)

Answer 1

[animepham]

`a/`

` 7/5 + 3 2/5 - 1 1/2 `

`= (7/5 + 17/5) - 3/2`

`= 24/5 - 3/2 `

`= 48/10 - 15/10 `

`= 33/10 `

`b/`

` 3 xx 2 4/9 xx 3/2 `

` = 3 xx 22/9 xx 3/2 `

` = 22/3 xx 3/2`

`= 11.`

`c/`

` 5/9 xx ( 2 1/6 - 1 2/3 ) `

`= 5/9 xx ( 13/6 -5/3 )`

`= 5/9 xx ( 13/6 - 10/6 ) `

`= 5/9 xx 3/6 `

`= 5/9 xx 1/2 `

`= 5/18`