Question

Tính nhanh:

1.(35 – 27) – (85-27) – 35

2. (2002 – 79 + 15) – (-79 +15)

3. 65 – (-187 + 122) – 187 + 110 + 22

4. - (135 - 28 + 136) + (-124 + 32 - 625)

*Đăng lại do bị lỗi ạ*

Answer 1

` (35 – 27) – (85-27) – 35`

` = 35 - 27 - 85 - 27 - 35`

` = (35-35) + (27 - 27) - 85`

` = 0 + 0 - 85`

` =- 85`

__________________________________

` (2002-79+15)-(-79+15)`
`=2002-79+15+79-15`
`=(-79+79)-(15-15) +2002`
`=0+0+2002`
`=2002`

_________________________________

` 65 – (-187 + 122) – 187 + 110 + 22`

` = 65 + 187 - 122 – 187 + 110 + 22`

` = (187 - 187) - (122 - 22) + 65+110`

` = 0 - 100 + 65 + 110`

` = -100 + 65 + 110`

` = -35 + 110`

` = 75`

_________________________________________

` - (135 - 28 + 136) + (-124 + 32 - 625)`

` =- 135 + 28 - 136 + (-124) + 32 - 625`

` = (-135 - 625) + (28 + (-124) + 32-136)`

` =  (-760) + ((-96) -104)`

` = (-760) + (-200)`

` = -960`

_____________________________________

`#BaoL i n h`

Answer 2

`1.(35 – 27) – (85-27) – 35`

`=35-27-85+27-35`

`=(35-35)+(-27+27)-85`

`=0+0-85`

`=-85`

`2. (2002 – 79 + 15) – (-79 +15)`

`=2002 – 79 + 15 +79 -15)`

`=2002+(-79+79)+(15-15)`

`=2002+0+0`

`=2002`

`3. 65 – (-187 + 122) – 187 + 110 + 22`

`=65 +187 - 122 – 187 + 110 + 22`

`=65+(187-187)+(-122+110+22)`

`=65+0+10`

`=75`

`4. - (135 - 28 + 136) + (-124 + 32 - 625)`

`=- 135 + 28 - 136 -124 + 32 - 625`

`=(-135-625)+(28+32)+(-136-124)`

`=-760+60-260`

`=-700-260`

`=-960`