a) 6² . 28 + 72 . 6²
= 36 . 28 + 72 . 36
= 36 . (28+72)
= 36 . 100
= 3600
b) 5(6) : 5(4) + 3 . 2² 8(???)
= 5(6-4) + 3 . 4 - (???)
= 5² + 3 . 4 - (???)
= 25 + 3 . 4 - (???)
= 37 - (???)
c) {132 - [116 - (16 - 8)]: 2}. 5
= {132 -[116 - 8]: 2}. 5
= {132- 108 : 2}.5
= {132 - 54}. 5
= 78 . 5
= 390
d) 36 :{ 336 :[200 -(12 + 8 . 20)]}
= 36 :{336 :[200 -(12 + 160)]}
= 36 :{336 :[200 - 172]}
= 36 :{336 : 28}
= 36 : 12
= 3
e) 86 -[15 .(64 - 39): 75 + 11]
= 86 -[15 . 25 : 75 + 11]
= 86 -[ 375 : 75 + 11]
= 86 -[5 + 11]
= 86 - 16
= 70
f) 55 -[49 -(2³ . 17 - 2³ . 14)]
= 55 -[49 -(8 . 17 - 8 . 14)]
= 55 -{49 -[8. (17 + 14)]}
= 55 -{49 -[8 . 31]}
= 55 -{49 - 248}
= 55 - (-199)
= 254