Question

Tính nhanh 99+87+99+13+99+45

Answer 1

99 + 87 + 99 + 13 + 99 + 45

= ( 99 + 99 + 99 ) + ( 87 + 13 ) + 45

= 297 + 100 + 45

= 397 + 45

= 442

Answer 2

99+87+99+13+99+45
=(99+99+99)+(87+13)+45
=297+100+45
=442

Answer 3

=(99+99+99)+(87+13)+45

=297+100+45

=397+45

=442