va rog mult dau coroana si maxim puncte!!!urgent am nevoie

Răspuns:
Ma gandesc ca ai nevoie doar la b!
[tex]3 \frac{1}{2} \times 2 - \frac{1}{3} = \frac{7}{2} \times \frac{2}{1} - \frac{1}{3} = \frac{21 \times 12 - 2}{6} = \frac{252}{6} = \frac{126}{3} = 42[/tex]