a/ 390 - \(2^6\) = 390 - 64 = 326
b/ 786 : ( \(3^2.2^3-7.10\) ) = 786 : ( 9 . 8 - 70 ) = 786 : (72 - 70) = 786 : 2 = 393
c/ 426 - ( \(5^2.3^2+4^3.3^5\)) = 426 - ( 25 - 9 + 64 . 243 ) = 426 - ( 25 - 9 + 15552 ) = 426 - 15568 = - 15142
d/ \(4^3-3^3=64-27=37\)
e/ \(5^2-4^2=25-16=9\)
Chúc bạn học tốt!!!