Question

2: Tính nhanh:

                a) 2004² - 16;                                       b) 892² + 892 . 216 + 108²          

                c) 36² + 26² – 52 . 36                           d) 37. 43

Answer 1

`2004^2 -16`

`=2004^2 -4^2`

`=(2004-4)(2004+4)`

`=2000.2008`

`= 4016000`

`-----------`

`892^2 + 892 . 216 + 108^2`

`=892^2 + 2.892 . 216 + 108^2`

`=(892+108)^2`

`=1000^2`

`=1000000`