Question

tính bằng cách thuận tiện: 2009*3.68+3.68-3.38*1010

Answer 1

2009 x 3,68 + 3,68 - 3,38 x 1010

= 3,68 x (2009 + 1) - 3,38 x 1010

= 3,68 x 2010 - 3,38 x 1010

= (3,68 - 3,38) x (2010 - 1010)

= 0,3 x 1000 

= 300

Answer 2

2009 x 3,68 + 3,38 - 3,38 x 1010

= 3,38 x ( 2009 + 1 ) - 3,38 x 1010

= 3,68 x 2010 - 3,38 x 1010

= ( 3,68 - 3,38 ) x ( 2010 - 1010 )

= 0,3 x 1000

= 300