(43 −13) . ( −3 ) +27.( −14 −16) ; b) ( −72) . ( 34 −12 ) −34. (12 −72) .
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(43 −13) . ( −3 ) +27.( −14 −16) ; b) ( −72) . ( 34 −12 ) −34. (12 −72) . giúp mình với
By Harper
By Harper
(43 −13) . ( −3 ) +27.( −14 −16) ; b) ( −72) . ( 34 −12 ) −34. (12 −72) .
giúp mình với
@py
Bài làm :
a, ( 43 −13 ) . ( −3 ) + 27 . ( −14 − 16 )
= 30 . ( -3 ) + 27 . ( -14 – 16 )
= 30 . ( -3 ) + 27 . ( -30 )
= -90 + ( -810 )
= -900
b, ( −72 ) . ( 34 − 12 ) − 34 . ( 12 − 72 )
= ( -72 ) . 22 – 34 . ( -60 )
= -1584 – ( -2040 )
= 456
(43 −13) . ( −3 ) +27.( −14 −16)
=30.(-3)+27.(-30)
=30.(-3)+(-27).30
=30.[(-3)+(-27)]
=30.(-30)
=-90
( −72) . ( 34 −12 ) −34. (12 −72) .
= (-72).34-(-72).12 +(-34).12+(-34).72
= (-72).34-(-72).12 +(-34).12+34.(-72)
=[(-72).34+34.72] + [72.12+(-34).12]
=0 + [12.38]
=0 + 456
=456