Question

Ex 13 si 14 va roooooog!!!!!

Answer 1

Răspuns:

13.

a.  5 rationale: $\sqrt{1}$=1; $\sqrt{4}$=2; $\sqrt{9}$=3; $\sqrt{16}$=4; $\sqrt{25}$=5

25 irationale

b.   1+2+3+4+5=15

c. $\sqrt{8}$

Explicație pas cu pas:

14.  

A={-1 ; 1}

B= {$\sqrt{9}$=3}  x∈N

C={-4; 2}

-x-1= 3

-x=3+1

x=-4

x+1 = 3

x=3-1

x= 2

D ={ -$\sqrt2}$ - 1; $\sqrt{2}$ - 1 }

-x-1= $\sqrt{2}$

-x = $\sqrt{2}$ + 1

x =- $\sqrt{2}$ -1

x+1 = $\sqrt{2}$

x = $\sqrt{2}$ - 1