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
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`
`49.15 – 5.49`
`= 49 . (15-5) `
`= 49 . 10`
`= 490`
`43.16 – 43. 13`
`= 43 . (16-13)`
`= 43 . 3`
`= 129`
`23.51 + 35.51 – 51. 18`
`= 51 . (23 + 35 – 18)`
`=51 . 40`
`= 2040`
`13. 52 + 52. 36 – 19. 52`
`= 52 . (13 + 36 – 19)`
`= 52 . 30`
`= 1560`
`98.36`
`= (100 – 2) . 36`
`= 100.36 – 2.36`
`= 3600 – 72`
`= 3528`
`999. 201`
`= (1000 – 1) . 201`
`= 1000 . 201 – 201`
`= 201000 – 201 `
`= 200799`
`98.37`
`= (100 – 2) . 37`
`= 100.37 – 2.37`
`= 3700 – 74`
`= 3626`
`9999.201`
`= (10000 – 1) . 201`
`= 10000.201 – 201`
`= 2010000 – 201 `
`= 2009770`
(Chúc bạn học tốt)