Explicație pas cu pas:
[tex] \frac{7}{30} = \frac{7 \times 6}{30 \times 6} = \frac{42}{180} [/tex]
[tex] \frac{8}{60} = \frac{8 \times 3}{60 \times 3} = \frac{24}{180} [/tex]
[tex] \frac{45}{90} = \frac{45 \times 2}{2 \times 90} = \frac{90}{180} [/tex]
