a, 510 : 17 + 25 . 2 - 16
= 30 + 50 - 16
= 80 - 16
= 64
b, 115 + [ 45 - ( 8 - 3 )² ]
= 115 + ( 45 - 5² )
= 115 + ( 45 - 25 )
= 115 + 20
= 135
c, 4 + ( -7 ) + 5 + ( -8 ) + 6 + ( -9 )
= ( 4 + 5 + 6 ) - ( 7 + 8 + 9 )
= 15 - 24
= -9
d, ( 44 . 52 . 60 ) : ( 11 . 13 . 15 )
= ( 44 : 11 ) . ( 52 : 13 ) . ( 60 : 15 )
= 4 . 4 . 4
= 64
e, Đặt E = 1 + 2 + 2² + 2³ + . . . + `2^62` + `2^63`
2E = 2 + 2² + 2³ + . . . + `2^62` + `2^63` + `2^64`
`=>` 2E - E = `2^64` - 1
`=>` E = `2^64` - 1
Vậy E = `2^64` - 1