Question

 

 

 

7,    –1911 – (1234 – 1911)                

 8,    156.72 + 28.156          

9,    32.( -39) + 16.( –22)

10,      –1945 – ( 567– 1945)                

11,     184.33 + 67.184          

12,       44.( –36) + 22.( –28)

 

Answer 1

7) -1911 -(1234-1911)

= - 1911 - 1234 + 1911

= (1911 - 1911) - 1234

= - 1234

8) 156.72 +28.156

= 156.(72 + 28)

= 156.100

= 15600

9) 32.(-39) + 16.(-22)

= 16.2.(-39) + 16.(-22)

= 16 . [2.(-39) + (-22)]

= 16 . [-78 - 22]

=16.(-100)

= -1600

Chúc bạn học tốt!

Answer 2

10) - 1945 - (567 - 1945)

= - 1945 -567 +1945

= (1945 - 1945) - 567

= -567

11) 184 . 33 + 67.184

=184.(33+67)

=184.100

=18400

12) 44.(-36) + 22 . (-28)

=22.2.(-36)+22.(-28)

=22.(2.(-36) +(-28))

= 22 . (-72-28)

= 22 . (-100)

= -2200

Answer 3

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Answer 4

7,   -1911-(1234-1911)

   = -1911-1234+1911

   = (-1911+1911)-1234

   =   0 - 1234 

  =     -1234

8,  156.72+28.156

  =  156. (72+28)

  =  156.100

  =    15600

9,  32.(-39)+16.(-22)

   =  16.2.(-39)+16.(-22)

   =   16.(-78)+16.(-22)

   =  16.((-78)+(-22))

   =  16.(-100)

   =   -1600

10,  -1945-(567-1945)

   =  -1945-567+1945

   =  (-1945+1945)-567

   =   0 - 567 = -567

11,  184.33+67.184

   =  184.(33+67)

   =   184 . 100

   =   18400

12,  44.(-36)+22.(-28)

   = 22.2.(-36)+22.(-28)

   = 22.(-72)+22.(-28)

   = 22. (-100)

   =   -2200