[tex]1. \: 2 \sqrt{3} \times 3 \sqrt{6} = 6 \sqrt{18} = 18 \sqrt{2} [/tex]
[tex]1b. \: 3x - 2 = 13 = > 3x = 15 = > x = 5[/tex]
[tex]2.a = \frac{1}{ \sqrt{2} } + 4 \sqrt{2} = \frac{ \sqrt{2} }{2} + 4 \sqrt{2} = \frac{9 \sqrt{2} }{2} [/tex]
[tex]b = \sqrt{18} + \sqrt{8} - \sqrt{32} = 3 \sqrt{2} + 2 \sqrt{2} - 4 \sqrt{2} = \sqrt{2} [/tex]
[tex]mg = \frac{9 \sqrt{2} }{2} \times \sqrt{2} = 9[/tex]
3. 3x+5y=11
4x-y=7
Prin scadere -x+6y=4
x=-11+y
3(-11+y)+5y=11
-33+8y=11
8y=44
y=11/2
x=-11+11/2
x=-11/2.
5. R=l=4cm
[tex]ap \frac{l \sqrt{3} }{2} = \frac{4 \sqrt{3} }{2} = 2 \sqrt{3} cm[/tex]
[tex]aria = \frac{ {3l}^{2} \sqrt{3} }{2} = \frac{48 \sqrt{3} }{2} = 24 \sqrt{3} {cm}^{2} [/tex]
Bafta si sper ca te-am ajutat. As mai fi lucrat dar nu imi permite timpul.
