Question

1 pe 2 - 1 pe 2 : 2 pe 3

Answer 1

Răspuns

$-\dfrac{1}{4}$

Explicație pas cu pas:

$\dfrac{1}{2}-\dfrac{1}{2}:\dfrac{2}{3}=\dfrac{1}{2}-\dfrac{1}{2}\cdot \dfrac{3}{2}=\dfrac{1}{2}-\dfrac{3}{4}= \dfrac{2-3}{4}=-\dfrac{1}{4}$

Answer 2

$\frac{1}{2} - \frac{1}{2} : \frac{2}{3} = \\ \\ \frac{1}{2} : \frac{2}{3} = \frac{1}{2} \times \frac{3}{2} = \frac{1 \times 3}{2 \times 2} = \frac{3}{4} \\ \\ \frac{1}{2} - \frac{3}{4} = \frac{1 \times 2}{2 \times 2} - \frac{3}{4} = \frac{2}{4} - \frac{3}{4} = \frac{2 - 3}{4} = - \frac{1}{4}$