Question

Tính nhanh : 49.(1153-39)-39.(1153-49)

Answer 1

49 . ( 1153 - 39 ) - 39 . ( 1153 - 49 )

= 49 . 1153 - 49 . 39 - 39 . 1153 + 39 . 49

= 49 . 39 - 49 . 39 + 49 . 1153 - 39 . 1153

= 0 + 1153 ( 49 - 39 )

= 1153 . 10

= 11530

Answer 2

49.(1153-39)-39.(1153-49)

=49.1153-49.39-39.1153+39.49

=49.1153-39.1153

=1153.(49-39)

=1153.10

=11530