a) 49.15 – 5.49 b) 43.16 – 43. 13 c) 23.51 + 35.51 – 51. 18 d) 13. 52 + 52. 36 – 19. 52e) 98.36 f) 999. 201 g) 98.37 h) 9999.201

`\text{a)}`

`49 .15 – 5 .49`

`= 49(15 -5)`

`= 49 . 10`

`= 490`

`\text{b)}`

`43 . 16 – 43 .13`

`= 43(16 – 13)`

`= 43 . 3 `

`=129`

`\text{c)}`

`23 . 51 + 35 . 51 – 51.18`

`=  52(23+35-18)`

`= 52 .40`

`= 2080`

`\text{d)}`

`13 . 52 + 52 . 36 – 19 . 52`

`= 52(13+36-19)`

`= 52 . 30`

`=  1560`

`\text{e)}`

`98 . 36`

`= 98(30+6)`

`= 98 . 30 + 98 . 6`

`= 2940 +  588`

`= 3528` 

`\text{f)}`

`999 . 201`

`= 999(200+1)`

`= 999 . 200 +999`

`= 199800 +999` 

`= 200799` 

`\text{g)}`

`98 . 37`

`= 98(30+7)`

`= 98 .30+98 .7`

`=2940 + 686`

`= 3626` 

`\text{h)}`

`9999 . 201`

`= 9999(200+1)`

`= 9999 . 200 + 9999`

`= 1999800 + 9999`

`=2009799`  

Trả lời