Răspuns:
Explicație pas cu pas:
1)
√4 = √2² = 2
√36 = √2² * 3² = 2 * 3 = 6
√64 = √2⁶ = 2³ = 8
p: 2 + 6 = 8 (adevarat)
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2)
[tex]a= 1 + \frac{1}{2} + \frac{1}{2^{2}} + \frac{1}{2^{3}} \\\\a = 1 + \frac{1}{2} +\frac{1}{4} + \frac{1}{8} \\\\a = \frac{8+4+2+1}{8} \\\\a= \frac{15}{8} \\\\\boxed{a=1,875}\\\\a \: treia\: zecimala\: este\: \boxed{5}[/tex]
