tính nhanh: (129.99+129)-(29.101-29) 25.50.125.64

`(129*99+129)-(29*101-29)`

`=(129*99+129*1)-(29*101-29*1)`

`=[129*(99+1)]-[29*(101-1)]`

`=[129*100]-[29*100]`

`=129*100-29*100`

`=(129-29)*100`

`=100*100`

`=10000`

`25*50*125*64`

`= 25 * 50 * 125 * 4 * 2 *8 `

`= 25 * 4 * 50 * 2 * 125 * 8 `

`= 100 * 100 * 1000 `

`= 10 000 000 `

`\color{pink}{@npanhhh}`