Proporție:
[tex] \frac{3}{4} = \frac{9}{12} [/tex]
[tex] \frac{3 \times 7}{4} = \frac{9 \times 7}{12} [/tex]
[tex] \frac{21}{4} = \frac{63}{12} [/tex]
Verificare: 21 × 12 = 63 × 4
252 = 252
[tex] \frac{3}{20} = \frac{9}{60} [/tex]
Verificare: 3 × 60 = 20 × 9
180 = 180
[tex] \frac{3}{4 \times 9} = \frac{9}{12 \times 9} [/tex]
[tex] \frac{3}{36} = \frac{9}{108} [/tex]
Verificare: 3 × 108 = 36 × 9
324 = 324
Sper că te-am ajutat! (ノ◕ヮ◕)ノ*:・゚✧