Question

289. 23+ 289. 76+ 289=

tính nhanh

Answer 1

`289. 23+ 289. 76+ 289`

`=289. 23+ 289. 76+ 289 .1`

`= 289 . ( 23 + 76 + 1)`

`= 289 . 100`

`= 28900`

Answer 2

`289.23+289.76+289`

`=289.23+289.76+289.1`

`=289.(23+76+1)`

`=289.100`

`=28900`

Answer 3

\(289.23+289.76+289=289.\left(23+76+1\right)=289.100=28900\)