Răspuns:
4)
[tex]\frac{x}{0.36} = \frac{4}{x}[/tex]
⇒ x² = 4·0.36
[tex]x^{2} =4*\frac{36}{100}\\[/tex]
[tex]x^{2} =\frac{36}{25}\\[/tex]
[tex]x\geq 0 => x=\frac{6}{5}\\[/tex]
5)
[tex]8.25-\frac{1}{2} :2=8.25-\frac{1}{2}*\frac{1}{2}=8.25-\frac{1}{4}=8.25-0.25=8[/tex]
6)
BC² = AB²+AC²
BC² = 6²+8²
BC² = 36+64
BC² = 100 ⇒ BC = 10
