Răspuns :
Răspuns: a < b
Explicație pas cu pas:
a = 2⁸⁷ - 2⁸⁶ - 2⁸⁵
a = 2⁸⁵ · (2⁸⁷⁻⁸⁵ - 2⁸⁶⁻⁸⁵ - 2⁸⁵⁻⁸⁵)
a = 2⁸⁵ · (2² - 2¹ - 2⁰)
a = 2⁸⁵ · (2² - 2 - 1)
a = 2⁸⁵ · (4 - 2 - 1)
a = 2⁸⁵ · 1
a = 2⁸⁵ = (2⁵)¹⁷ = 32¹⁷
b = 5⁸⁶ - 4 · 5⁸⁵
b = 5⁸⁵ · (5⁸⁶⁻⁸⁵ - 4 · 5⁸⁵⁻⁸⁵)
b = 5⁸⁵ · (5¹ - 4 · 5⁰)
b = 5⁸⁵ · (5 - 4 · 1)
b = 5⁸⁵ · 1
b = 5⁸⁵
a < b
[tex]\it \left.\begin{aligned} \it a=2^{85}(2^2-2-1)=2^{85}\\ \\\it b=5^{85}(5-4)=5^{85}\ \ \ \ \ \ \ \end{aligned}\right\} \Rightarrow a<b[/tex]