52/15:16/30 24/17:72/6

Đáp án

$\dfrac{52}{15}$ : $\dfrac{16}{30}$ 
= $\dfrac{52}{15}$ $\times$ $\dfrac{30}{16}$
= $\dfrac{52 \times30 }{15 \times 16}$
= $\dfrac{13}{2}$ = 6,5
$\dfrac{24}{17}$ : $\dfrac{72}{6}$
= $\dfrac{24}{17}$ $\times$ $\dfrac{6}{72}$
= $\dfrac{24 \times 6}{ 17 \times 72}$
= $\dfrac{2}{17}$