Question

vă roggg
dau coroanăăăăăăă​

Answer 1

Răspuns:

$\frac{ {3}^{20} - {3}^{18} }{ {3}^{17} + {3}^{20} } = \frac{ ({3}^{2} - 1) \times {3}^{18} }{(1 + {3}^{3} ) \times {3}^{17} } = \frac{(9 - 1) \times 3}{1 + 27} = \frac{8 \times 3}{28} = \frac{2 \times 3}{7} = \frac{6}{7}$

$\frac{ {3}^{23} - {3}^{21} }{ {3}^{21} + {3}^{23} } = \frac{( {3}^{2} - 1) \times {3}^{21} }{(1 + {3}^{2}) \times {3}^{21} } = \frac{9 - 1}{9 + 1} = \frac{8}{10 } = \frac{4}{5}$

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