Question

81/c=9/13=d/39 resposta


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Answer 1

$\dfrac{81}{c}=\dfrac{9}{13}=\dfrac{d}{39}$

$\dfrac{81}{c}=\dfrac{9}{13}$

$9c=81\cdot13 \iff c=\dfrac{81\cdot13}{9} \iff c=9\cdot13$

$c=117$

$\dfrac{9}{13}=\dfrac{d}{39}$

$13d=9\cdot39 \iff d=\dfrac{9\cdot39}{13} \iff d=9\cdot3$

$d=27$

$\dfrac{81}{117}=\dfrac{9}{13}=\dfrac{27}{39}$