Question

Tính hợp lí nhất:

1) -1911 - (1234 - 1911)

2) 156 . 72 + 28 . 156

3) 32 . (-39) + 16 . (-22)

4) -1954 - (567 - 1954)

5) 184 . 33 + 67 . 184

6) 44 . ( -36) + 22 . (-28)

(Mk cần gấp)

Answer 1

1) -1911 -( 1234 -1911)

= -1911 - 1234 + 1911 = -1234

2) 156.72+ 28. 156

= 156.(72+28)

= 156. 100

= 15600

3)32. (-39) + 16.(-22)

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

= 16. (-78) + 16.(-22)

= 16.[(-78) + (-22)]

= 16. (-100)

= -1600

4) -1954 - (567 - 1954)

= -1954 - 567 + 1954

= -567

5)184. 33 + 67. 184

= 184.(33+ 67)

= 184. 100

= 18400

6) 44. (-36) + 22. (-28)

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

= 22.(-72) + 22.(-28)

= 22. [(-72)+ (-28)]

= 22. (-100)

= -2200

Answer 2

1) -1911 - (1234 - 1911)

= -1911 - 1234 + 1911

= (-1911 + 1911 ) + 1234

= 0 + 1234

= 1234

2) 156 . 72 + 28 . 156

= 156 . ( 72 + 28 )

= 156 . 100

= 15600

3) 32 . (-39) + 16 . (-22)

= [ 32 . (-39) ] + [ 16 . (-22) ]

= -1248 + (-352)

= - 1600

4) -1954 - (567 - 1954)

= -1954 - 567 + 1954

= (-1954 + 1954) + 567

= 0 + 567

= 567

5) 184 . 33 + 67 . 184

= 184 . (33 + 67)

= 184 . 100

= 18400

6) 44 . ( -36) + 22 . (-28)

= [ 44 . (-36) ] + [ 22 . (-28) ]

= -1584 + (-616)

= -2200

Answer 3

1, -1911 - (1234 - 1911)

= -1911 - 1234 + 1911

= 1911 - 1911 - 1234

= 0 - 1234

= -1234

Answer 4

2, 156.72 + 28.156

= 156( 72 + 28 )

= 156 . 100

= 15600

Answer 5

3, 32.(-39) + 16.(-22)

= -39.2.16 - 22.16

= -78.16 - 22.16

= -(78.16 + 22.16)

= -16( 78 + 22 )

= -16 . 100

= -1600

Answer 6

4, -1954 - (567 - 1954)

= -1954 - 567 + 1954

= 1954 - 1954 - 567

= 0 - 567

= -567

Answer 7

5, 184.33 + 67.184

= 184( 33 + 67 )

= 184 . 100

= 18400

Answer 8

6, 44.(-36) + 22.(-28)

= -36.2.22 - 22.28

= -72.22 - 22.28)

= -(72.22 + 22.28)

= -22(72 + 28)

= -22.100

= -2200

Answer 9

https://i.imgur.com/A0DJ8EO.jpg