Điền số thích hợp vào ô trống:
\(\begin{array}{l}
a)\frac{3}{4} = \frac{{...}}{{20}}\\
b)\frac{4}{5} = \frac{{12}}{{...}}\\
c)\frac{{...}}{9} = \frac{{ - 16}}{{36}}\\
d)\frac{7}{{...}} = \frac{{21}}{{ - 39}}
\end{array}\)
\(\begin{array}{l}
a)\frac{3}{4} = \frac{{15}}{{20}}\\
b)\frac{4}{5} = \frac{{12}}{{15}}\\
c)\frac{{ - 4}}{9} = \frac{{ - 16}}{{36}}\\
d)\frac{7}{{ - 13}} = \frac{{21}}{{ - 39}}
\end{array}\)
-- Mod Toán 6
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