erweitern (81(n+1)^2)/(4n^2)

Lösung

erweitern

\frac{81 ( n + 1 ) ^{2}}{4 n ^{2}}

\frac{81}{4} + \frac{81}{2 n} + \frac{81}{4 n ^{2}}

Schritte zur Lösung

\frac{81 ( n + 1 ) ^{2}}{4 n ^{2}}

(n + 1)^{2} = n^{2} + 2 n + 1

= \frac{81 ( n ^{2} + 2 n + 1 )}{4 n ^{2}}

Multipliziere aus

81 (n^{2} + 2 n + 1) : 81 n^{2} + 162 n + 81

= \frac{81 n ^{2} + 162 n + 81}{4 n ^{2}}

Wende Bruchregel an:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{81 n ^{2} + 162 n + 81}{4 n ^{2}} = \frac{81 n ^{2}}{4 n ^{2}} + \frac{162 n}{4 n ^{2}} + \frac{81}{4 n ^{2}}

= \frac{81 n ^{2}}{4 n ^{2}} + \frac{162 n}{4 n ^{2}} + \frac{81}{4 n ^{2}}

Streiche

\frac{81 n ^{2}}{4 n ^{2}} : \frac{81}{4}

= \frac{81}{4} + \frac{162 n}{4 n ^{2}} + \frac{81}{4 n ^{2}}

Streiche

\frac{162 n}{4 n ^{2}} : \frac{81}{2 n}

= \frac{81}{4} + \frac{81}{2 n} + \frac{81}{4 n ^{2}}

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e x p an d cos (2) (π - x)

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