`Bài 1`
`a, 76 . 52 + 76 . 49 - 76`
`= 76 . (52 + 49 - 1)`
`= 76 . 100`
`= 7600`
`b, 64 + 2 . [78 - (8 - 6)^3]`
`= 64 + 2 . [78 - 2^3]`
`= 64 + 2 . [78 - 8]`
`= 64 + 2 . 70`
`= 64 + 140`
`= 204`
`c, 356 - {11 + [3^2 . 3 + 5^25(3^2 - 9)]}`
`= 356 - {11 + [3^2 . 3 + 5^25(9 - 9)]}`
`= 356 - {11 + [3^2 . 3 + 5^25 . 0]}`
`= 356 - {11 + [9 . 3 + 0]}`
`= 356 - {11 + 27}`
`= 356 - 38`
`= 318`
