1)
[tex] \frac{1}{2}* \frac{3}{4}-( \frac{1}{2})^{2}= \frac{3}{8}- \frac{1}{4} =\frac{3}{8}- \frac{2}{8}= \frac{1}{8} [/tex]
2)
a × b = 300
[a, b] = 60
(a,b) = a × b / [a, b] = 300 / 60 = 5
3)
3/8 ..............................18
8/8............................... x
x =(8 / 8) × 18 / (3 / 8) = 8 × 18 / 3 = 48 ani
4)
40% * 25 = 40 * 25 / 100 = 40 / 4 = 10 Baieti
25 - 10 = 15 Fete
5)
<ABC ≡ <ACB , atunci ΔABC este isoscel cu Varful A si baza BC.