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Dacă 1 supra 2 plus 1 supra 3 plus 1 supra n egal cu 1 atunci n egal cu...​

Răspuns :

Răspuns:

    n = 6

Explicație pas cu pas:

    [tex]\frac{1}{2}+\frac{1}{3}+\frac{1}{n}=1[/tex]

    n ≠ 0

    [tex]\frac{3}{6}+\frac{2}{6}+\frac{1}{n}=1[/tex]

    [tex]\frac{5}{6}+\frac{1}{n}=\frac{1}{1}[/tex]

    [tex]\frac{1}{n}=\frac{6}{6}-\frac{5}{6}[/tex]

    [tex]\frac{1}{n}=\frac{1}{6}[/tex]

    [tex]n = \frac{1*6}{1}[/tex]

    [tex]n = 6[/tex]

[tex]\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{n}}} = 1\\ \\ \\\Rightarrow \dfrac{1}{2+\dfrac{1}{\dfrac{3n+1}{n}}} = 1 \Rightarrow \dfrac{1}{2+\dfrac{n}{3n+1}} = 1\\ \\ \\ \Rightarrow \dfrac{1}{\dfrac{6n+2+n}{3n+1}} = 1 \Rightarrow \dfrac{3n+1}{7n+2} = 1\\ \\ \\ \Rightarrow 3n+1 = 7n+2 \Rightarrow 7n-3n = 1-2\Rightarrow 4n = -1\\ \\ \\ \Rightarrow \boxed{n =-\dfrac{1}{4}}[/tex]