4x - 20 = 2 mũ 5 chia 2 mũ 3 117 + ( 25 - ( 4 - ( 3 mũ 2 - 12 )

Đáp án:

`4x-20 = 2^5 : 2^3`

`4x-20 = 2^2`

`4x-20 = 4`

`4x=4+20`

`4x=24`

`x=24:4`

`x=6`

Vậy `x=6`.

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`117 + {25 - [ 4-(3^2 - 12)]}`

`= 117 + {25 - [4 - (9-12)]}`

`= 117 + {25 - [4 +3]}`

`= 117 + {25 - 7}`

`= 117 + 25 - 7`

`= (117-7) + 25`

`= 110+25 = 135`.