Question

5 6 7 8 9 DAU coroana

Answer 1

5) $- \sqrt{5} , \sqrt{7}$
6)
L=3l
A=L*l
$a = 3 {l}^{2}$
$3 {l}^{2} = 243$
${l}^{2} = 81$
l=9
L=27

7)
$ma = \frac{7 + 63}{2} = 35$
$mg = \sqrt{7 \times 63} = \sqrt{441} = 21$
Ma-Mg= 35-21=14

8)
$2 {x}^{2} - 1 = 49$
$2 {x}^{2} - 50 = 0 \\ {x }^{2} - 25 = 0 \\ (x - 5)(x + 5) = 0$
x1=5
x2=-5

9)nu stiu