Bài 1:
` a)` ` -524. [23 +(-45)]+524. (-45+ 123) `
` = 524.[-23 +45+(-45)+ 123] `
`= 524.(123-23)`
`=524.100`
`=52400`
`b) ` ` 47.69 - 31. (-47)`
`=47.9+31.47`
`=47.(69+31)`
`=47.100`
`=4700`
`c) ` ` 16. (38 – 2) – 38. (16 – 1)`
`=16.38-16.2-16.38+38`
`=-16.2+38`
`=-38+38`
`=0`
`d)` ` (-41). (59 + 2) + 59. (41 – 2)1
`=-41.59-41.2+41.59-2.59`
`=-41.2-2.59`
`=2.(-59-41)`
`=-200`
` e) ` ` 125 . (-8) . (-25) . 9 . 4 . 100^0 : 3 `
` = -1000 . (-25) . 36 . 1 : 3 `
` = 25000 . 36 : 3 `
` = 25000 . 12 `
` = 300000 `