Question

daca x + 1/x=5 atunci x la a doua +1/x la a doua =?

Answer 1

(x+1)/x = 5

x+1=5x

x-5x= -1

-4x= -1

x=1/4

(x+1)/x=5 |^2

(x+1)^2/x^2=25

(x^2+2x+1)/x^2 =25

(x^2 +2* 1/4 +1)/x^2 =25

(x^2+1)/x^2 +1/2=25

(x^2+1)/x^2 =25 -1/2

(x^2+1)/x^2= (50-1)/2

(x^2+1)/x^2=49/2

Answer 2

Cred ca este vorba despre:
$x+ \frac{1}{x} =5$
Si ne cere:
$x^{2} + \frac{1}{ x^{2} } =?$
Vezi atasamentul:

e2489d4347f3af0a75d71b03972b2c38.doc

493f30466de4f399d48f2e599a89e4e8.docx