a) 6 . 63 = 9 . 42
\(\frac{6}{9}=\frac{42}{63}\) ; \(\frac{6}{42}=\frac{9}{63}\) ; \(\frac{9}{6}=\frac{42}{63}\) ; \(\frac{42}{6}=\frac{63}{9}\)
b) 0,24 . 1,61 = 0,84 . 0,46
\(\frac{0,24}{0,84}=\frac{0,46}{1,61}\) ; \(\frac{0,24}{0,46}=\frac{0,84}{1,61}\) ; \(\frac{0,84}{0,24}=\frac{1,61}{0,46}\) ; \(\frac{0,46}{0,24}=\frac{1,61}{0,84}\)