Đáp án:
28 . 78 + 28 . 13 + 28 . 9 -26
= 28 . (78 + 13 + 9) - 26
= 28 .100 - 26
= 2800 - 26
= 2774
4 . {`3^{2}`.[(`5^{2}` + `2^{3}`) : 11] - 26} + 2002
= {9.[(25 + 8) : 11] - 26} + 2002
= {9.[33 : 11] - 26} + 2002
= {9 . 3 - 26} + 2002
= {27 - 26} + 2002
= 1 + 2002
= 2003
1449 - {[(216 + 184) : $2^{3}$ ] . $3^{2}$}
= 1449 - {[(216 + 184) : 8 ] . 9}
= 1449 - {[ 400 : 8 ] . 9}
= 1449 - {50 . 9}
= 1449 - 450
= 999
$4^{8}$ : $4^{5}$ - ($1^{30}$ + 17) : $3^{2}$
= $4^{3}$ - ($1^{30}$ + 17) : $3^{2}$
= 64 - (1 + 17) : 9
= 64 - 18 : 9
= 64 - 2
= 62