Đáp án:
a, 45 - [ (18 - 15)² + $2^{4}$ ]
= 45 - [ 3² + 16 ]
= 45 - [ 9 + 16 ]
= 45 - 25
=20
b, A = 50 + {30 - 2[14 - 48 : 4²]}
A = 50 + {30 - 2[ 14 - 48 : 16]}
A = 50 + {30 - 2[ 14 - 3]}
A = 50 + {30 - 2.11}
A = 50 + {30 - 22}
A = 50 + 8
A = 58.
c, 65 . 59 + 65 . 42 - 13 . 5
= 65 . 59 + 65 . 42 - 65 . 1
= 65 . (59 + 42 - 1)
= 65 . 100
= 6500