Mấy anh chị giúp em ạ

`text(Bài 3 :)`

`4 × 125 × 25 ×8`

`= 4 × 25 × 8 × 125`

`= 100 × 1000`

`= 100000`

`2 × 8 × 50 × 25 × 125'`

`= 2 × 50 × 8 × 125 × 25`

`= 100 × 1000 × 25`

`= 2500000`

`2 × 3 × 4 × 5 × 50 × 25`

`= 2 × 50 × 4 × 25 × 3`

`= 100 × 100 × 3`

`= 30000`

`25 × 20 × 125 × 8 - 8 × 20 × 5 × 125`

`= 500 × 1000 - 1000 × 100`

`= 1000 × (500 - 100)`

`= 400000`

`text(Bài 4 :)`

`8 × 427 × 3 + 6 × 573 × 4`

`= 24 × 427 + 24 × 573`

`= 24 × 1000`

`= 24000`

`6 × 1235 × 20 - 5 × 235 × 24`

`= 120 × 1235 - 120 × 235`

`= 120 × 1000`

`= 120000`

`(145 × 99 + 145) - (143 × 102 - 143)`

`= 145 × 100 - 143 × 101`

`= 14500 - 14443`

`= 57`

`54 × 47 - 47 × 53 - 20 - 27`

`= 54 × 47 - 47 × 53 - 47`

`= 47 × (54 - 53 - 1)`

`= 47 × 0`

`= 0`