Question

tính nhanh B = 2010 x 2020 - 1010 / 2011 x 2019 - 1019 

 

Answer 1

`B = (2010 xx 2020 - 1010 )/( 2011 xx 2019 - 1019 )`

`B = (2010 xx (2019 + 1) - 1010 )/( 2011 xx 2019 - 1019 )`

`B = (2010 xx 2019 + 2010 - 1010 )/( 2011 xx 2019 - 1019 )`

`B = (2010 xx 2019 + 1000 )/( 2011 xx 2019 - 1019 )`

`B = (2010 xx 2019 + 1000 )/( (2010 + 1) xx 2019 - 1019 )`

`B = (2010 xx 2019 + 1000 )/( 2010  xx 2019 + 2019- 1019 )`

`B = (2010 xx 2019 + 1000 )/( 2010  xx 2019 + 1000 )`

`B = 1`