Calculează:
Vă rog am nevoie urgent. Dau coroană.

a)
[tex]0.5 - \frac{1}{2} \times ( \frac{3}{4} - 0.25) = \frac{1}{2} - \frac{1}{2} \times ( \frac{3}{4} - \frac{1}{4} ) = \frac{1}{2} - \frac{1}{2} \times \frac{1}{2} = \frac{1}{2} - \frac{1}{4} = \frac{1}{4} [/tex]