Question

Tính nhanh

29 . ( 19 - 13 ) - 19 . ( 29 - 13 ) 

Answer 1

29 . ( 19 - 13 ) - 19 . ( 29 - 13 )

= 29 . 19 - 29 . 13 - 19 . 29 - 19 . 13

= ( 29 . 19 . 29 - 19 ) . [ - 29 . 13 - ( - 19 . 13 ) ]

=  0 . [ - 29 . 13 + 19 . 13 ]

= 0 . ( - 10 ) . 13

= - 10 . 13

= - 130

Answer 2

=29.19-29.13-19.29-29.13

=0

Answer 3

29.(19-13)-19.(29-13)

=29.6-19.6

=6.(29-19)

=6.10

=60

Answer 4

29 . ( 19 - 13 ) - 19 . ( 29 - 13 )

= 29 . 6 - 19 . 6 

= ( 29 - 19 ) . 6

= 10 . 6 = 60