Question

repede vă rog doar ce știti și voi​

Answer 1

Răspuns:

1. a) Ma= (3+ 2$\sqrt{2}$ + 3- 2$\sqrt{2}$):2= 6:2 = 3    Ma= (a+b):2

b) Mg= $\sqrt{a*b}$ = $\sqrt{1}$= 1

(3+ 2$\sqrt{2}$ )*( 3- 2$\sqrt{2}$)= 9 -6$\sqrt{2}$ + 6 $\sqrt{2}$ - 4*2= 9-8=1

c) ($\sqrt{5} + \sqrt{3} ) *(\sqrt{5} - \sqrt{3} ) - \sqrt{\sqrt{81} }$=5- $\sqrt{15}$ + $\sqrt{15}$ - 3 - 3= 5-3-3= 2-3=-1

d) ( $3\sqrt{5} + 2\sqrt{2} ) * ( 3\sqrt{5} + 2\sqrt{2}) - 12\sqrt{10}$= 9*5 +6$\sqrt{10}$ + 6$\sqrt{10}$ + 8- 12$\sqrt{10}$=

45+8 +12$\sqrt{10}$ - 12 $\sqrt{10}$= 53

2. b) 2x-6=0   2x= 6  x= 6:2=3   x=3

3. a) AC= $\sqrt{BC^{2}- AB^{2} }$= $\sqrt{25-16}$= $\sqrt{9}$= 3 cm   AC=3 cm

b) sin B= AC/BC= 3/5