Appliquer la formule : $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, où $a=z$, $b=y$, $c=5$, $a/b=\frac{z}{y}$, $f=x$, $c/f=\frac{5}{x}$ et $a/bc/f=\frac{z}{y}\frac{5}{x}$
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