Bài 1:
[(195 - 45 : 15) : 3] ² = [(195 - 3) : 3] ² = (192 : 3) ² = 64² = 4096
Bài 2:
a, 100 - l 180 - ( 65 + 35)l : 2 = 100 - l 180 - 90l : 2 = 100 - 90 : 2 = 100 - 45 = 55
b, 36 : {336:[200 - (12+8.20)]} = 36 : { 336 : [200 - ( 12 + 160)]}
= 36 : [336 : (200 - 172)]
= 36 : (336 : 28)
= 36 : 12
= 2
c, 86-[15.(64-39):75+11] = 86 - ( 15 . 25 : 75 + 11)
= 86 - ( 375 : 75 + 11)
= 86 - (5 + 11)
= 86 - 16
= 70
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