Bài 2:
a) \(2^3.5-2^3.3+2^3.88=2^3.\left(5-3+88\right)=8.90=720\)
b) (42 - 69 - 17) - (42 - 17)
= 42 - 69 - 17 - 42 + 17
= 42 - 42 - 69 - 17 + 17
= - 69
c) 53 . 39 + 47 . 39 - 53 . 21 - 47 . 21
= 39. (53 + 47) - 21. (53 + 47)
= 39 . 100 - 21 . 100
= (39 - 21).100
= 18 . 100
= 1800
d) \(80-\left(4.5^2-3.2^3\right)=80-\left(4.25-3.8\right)=80-\left(100-24\right)=80-100+24=4\)
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