Tính nhanh a ) 2015×2014+4030/2015×2015+2015 b) 2015×4016-2015×20000/2015×2019-6045

1 câu trả lời

`a ) (2015 xx 2014 + 4030)/(2015xx2015 + 2015)`

`= (2015 xx 2014 + 2015 xx 2)/(2015 xx 2015 + 2015 xx 1)`

`= (2015 xx (2014 + 2))/(2015 xx ( 2015 + 1))`

`= (2015 xx 2016)/(2015xx2016)`

`= 1`

`b ) (2015 xx 4016 - 2015 xx 2000)/(2015 xx 2019 - 6045`

`= (2015 xx ( 4016 - 2000))/(2015 xx 2019 - 2015 xx 3)`

`= (2015 xx 2016)/(2015 xx ( 2019 - 3))`

`= (2015 xx 2016)/(2015 xx 2016)`

`= 1`

`#dtkc`