Question

tính :

(- 57).(67- 34) - 67 . (34 - 57)

Answer 1

(-57) . (67-34) - 67 . (34-57)

= -57 . 33 - 67 . (-23)

= -1881 - (-1541)

= -340

Answer 2

(- 57).(67- 34) - 67 . (34 - 57)

= ( -57 ) . 67 - ( -57 ) . 34 - 67 . ( -23 )

= 67 . ( -57 + 23 ) + 57 . 34

= 67 . ( -34 ) + 57 . 34

= -67 . 34 + 57 . 34

= 34 . ( -67 + 57 )

= 34 . ( -10 )

= -340

Answer 3

(-57).(67-34) - 67.(34-57)

=(-57).33-67.(-23)

=(-1881)-(-1541)

=-340

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