Question

3. Efecutati
a) 1/2×0,5-0,25
b) 1+2/5×1,5
c)1/2+1/3×15
d) 2÷8+0,75​

Answer 1

$\frac{1}{2} \times 0.5 - 0.25 = \frac{1}{2} \times \frac{1}{2} - \frac{1}{4} = \frac{1}{4} - \frac{1}{4} = 0$

$1 + \frac{2}{5} \times 1.5 = 1 + \frac{2}{5} \times \frac{3}{2} = 1 + \frac{1}{5} \times 3 = 1 + \frac{3}{5} = \frac{8}{5} = 1.6$

$\frac{1}{2} + \frac{1}{3} \times 15 = \frac{1}{2} + 5 = \frac{11}{2} = 5.5$

$2 \div 8 + 0.75 = 0.25 + 0.75 = 1$