Question

Va rog ,e pe maine!!
Dau coroană!
Va rog ,repede!!​

Answer 1

Răspuns:

Explicație pas cu pas:

1.

a. 9-8

b. $2\sqrt{5}+3 \sqrt{5}+\sqrt{5}=6\sqrt{5}$

c. $\sqrt{36+64} -9=10-9$

3.

a. $5\sqrt{2} +6\sqrt{2}+9\sqrt{2}-7\sqrt{2}-4\sqrt{2}=9\sqrt{2}$

b. (24 +6 -6 +36)/$\sqrt{3}$=60/$\sqrt{3}$=20$\sqrt{3}$

4.

13 · 13 = $x^{2}$, x=±13

$x^{2} =49$, x=±7

$(x+1)^{2} = 16, x+1=$±4, x+1=4⇒x1=3, x+1=-4⇒x2=-5

5.

a. $\sqrt{(5\sqrt{2}. 10\sqrt{2} }=\sqrt{5 .2. 10} =\sqrt{100}=10$

b. $\sqrt{\frac{16}{5}.5} =\sqrt{16}=4$