Răspuns:
1) C
2) C
Explicație pas cu pas:
1) [tex](\sqrt{3}+2)^{2}+(\sqrt{3}-2)^{2}-(2\sqrt{3}+1)^{2}[/tex]
[tex]3+4\sqrt{3}+4+3-4\sqrt{3}+4-(12+4\sqrt{3}+1)[/tex]
[tex]3+4+3+4-(13+4\sqrt{3})[/tex]
[tex]14-13-4\sqrt{3}[/tex] = [tex]1-4\sqrt{3}[/tex]
2) 4 r .......... 9 h
6 r .......... x h
x = [tex]\frac{9*4}{6}[/tex] = 3 × 2 = 6 h
