Question

Clasa a 7 Mate
pls dacă se poate măcar una sau două

Answer 1

$1. \: 2 \sqrt{3} \times 3 \sqrt{6} = 6 \sqrt{18} = 18 \sqrt{2}$

$1b. \: 3x - 2 = 13 = > 3x = 15 = > x = 5$

$2.a = \frac{1}{ \sqrt{2} } + 4 \sqrt{2} = \frac{ \sqrt{2} }{2} + 4 \sqrt{2} = \frac{9 \sqrt{2} }{2}$

$b = \sqrt{18} + \sqrt{8} - \sqrt{32} = 3 \sqrt{2} + 2 \sqrt{2} - 4 \sqrt{2} = \sqrt{2}$

$mg = \frac{9 \sqrt{2} }{2} \times \sqrt{2} = 9$

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

$ap \frac{l \sqrt{3} }{2} = \frac{4 \sqrt{3} }{2} = 2 \sqrt{3} cm$

$aria = \frac{ {3l}^{2} \sqrt{3} }{2} = \frac{48 \sqrt{3} }{2} = 24 \sqrt{3} {cm}^{2}$

Bafta si sper ca te-am ajutat. As mai fi lucrat dar nu imi permite timpul.