Bài 1: Tính nhanh a) (− 8) .25.(- 2) .4. (-5) .125 b) 47.69.31.(- 47) c) - 4.2.6.25.(- 7) .5 d) (−167) .83 +167. (-17) -33 e) 19.25+ 9.95+ 38.15 f) (−32) .125. (-9) . (-25 ) g) (−3879− 3879− 3879− 3879) .(-25 ) h) 369. (-2)− 41.72 giúp mik vs nha

Đáp án+Giải thích các bước giải:

a) `(− 8) . 25 . (- 2) . 4 . (-5) .125`

`=  [(-8) . 125] . [25 . 4] . [(-2) . (-5)]`

`= (-1000) . 100 . 10`

`= -1000000`

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b) `47. 69 . 31 . (- 47)`

`= 3243 . (-1457)`

`= -4725051`

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c) `- 4 . 2 . 6 . 25 . (- 7) . 5 `

`= [(-4) . 25] . [2 . 5] . [6 . (-7)]`

`= (-100) . 10 . 42`

`= (-1000) . 42`

`= -42000`

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d) `(−167) . 83 +167. (-17) - 33` 

`= (-167) . [83 + 17] - 33`

`= (-167) . 100 - 33`

`= (-16700) - 33`

`= -16733`

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e) `19 . 25 + 9 . 95 + 38 .15`

`=  475 + 855 + 570`

`= 1900`

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f) `(−32) . 125 . (-9) . (-25 )`

`= (-4000) . 225`

`= -900000`

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g) `(−3879− 3879− 3879− 3879) . (-25 )`

`= (-15516) .  (-25)`

`= 387900`

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h) `369. (-2)− 41.72`

`= (-738) - 2952`

`= -3690`