Giúp mik gấp vs 1 a) 4x25-12x5+170:10 b) (7+27:9).4-3 c) 12: {400:[500-(125+25x7)]} d) 168+ {[2x (16+9)-256]:14}

`4.25-12.5+170:10`

`= 100 - 60 + 17`

`= 57`

`(7+27:9).4-3`

`= ( 7 + 3 ) . 4 - 3 `

`= 10 . 4 - 3 `

`= 40 - 3 `

`= 37 `

`12:{400:[500-(125+25.7)]}`

`= 12:{400:[500-( 125 + 175 )]}`

`= 12:{400:[500- 300 ]}`

`= 12:{400: 200 }`

`= 12 : 2`

`= 6`

 `168+ {[2x (16+9)-256]:14}`

`= 168+{[2.(16 + 9 ) - 1 ] : 49}`

`=168+{[ 2 . 25  - 1 ]: 49}`

`= 168+ {( 50 - 1 ) : 49}`

`= 168 + {49 : 49}`

`= 168 + 1`

`= 169`