Tính nhanh : a, 46 + 17 + 54 b, 4 . 37 . 25 c,87 . 36 + 87 . 64

a) `46 + 17 + 54`

`= (46+54)+17`

`= 100 + 17`

`= 117`

b) `4.37.25`

`= (4.25).37`

`= 100 . 37`

`= 3700`

c) `87.36 + 87 .64`

`= 87. (36+ 64)`

`= 87 . 100`

`= 8700`

Đáp án:

a) 46 + 17 + 54= ( 46 + 54 ) + 17

= 100 +17

= 117

b) 4 .37 .25 = (4.25). 37

= 100 . 37

= 3700

c) 87 . 36 + 87 . 64 = 87. ( 36 + 64 )

= 87 . 100

= 8700