Question

Tính : 

a ) 65.(-19) + 19 . ( -24 )

b ) 45- 15 : 3

c ) 15 - ( - 85 ) - ( -70 ) + 15 + ( -85 )

d ) 737737. 255 - 255255 . 737 

 

Answer 1

a) 65 . ( - 19 ) + 19 . ( - 24 )

= - 65 . 19 + 19 . ( - 24 )

= ( - 65 + - 24 ) . 19

= - 89 . 19

= - 1691

b ) 45 - 15 : 3

= 45 - 5

= 40

c ) 15 - ( - 85 ) - ( - 70 ) + 15 + ( - 85 )

= 15 + 85 + 70 + 15 + ( - 85 )

= 15 + 15 + 85 + ( - 85 ) + 70

= 30 + [ 85 + ( -85 ) ] + 70

= 30 + 0 + 70

= 30 + 70

= 100

d) 737737 . 255 - 255255 . 737

= 737 . 1001 . 255 - 255 . 1001 . 737

= ( 737 . 255 - 737 . 255 ) . 1001

= 0 . 1001

= 0

NHỚ K CHO MK NHA

Answer 2

a) = (-1235) + (-456)

   =-1691

b) 45 - 15:3

   = 45 - 5

   = 40

c) 15 - ( -85) - (-70) + 15 + (-85)

 = 15 + 15 - (-85) - 85 -( -70)

= 30 - 0 - (-70)

= 100

d) =737.1001. 255 - 255.1001.737

    = 0

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