Question

Am nevoie pentru mâine ​

Answer 1

ai rezolvarile atasate.

Answer 2

$\it e)\ \ Not\breve am\ \sqrt5x=t\ \Rightarrow\ 5x^2=t^2,\ iar\ ecua\c{\it t}ia\ devine:\\ \\ t^2-(t+1)^2=-2t+2\ \Rightarrow\ \not t^2-\not t^2-2t-1=-2t+2\ \Rightarrow\ -2t-1=-2t+2\ \Rightarrow\ \\ \\ -2t+2t=2+1\ \Rightarrow\ 0t=3\ \Rightarrow\ ecua\c{\it t}ie\ imposibil\breve a\ \Rightarrow\ S=\varnothing$

$\it f)\ \ (x+1)^2-(2x+1)^2=(x-3)^2-(2x-3)^2\ \Rightarrow\\ \\ \ \Rightarrow\ x^2+2x+\not1-4x^2-4x-\not1=x^2-6x+\not9-4x^2+12x-\not9\ \Rightarrow\ \\ \\ \ \Rightarrow\ -3x^2-2x=-3x^2+6x\ \Rightarrow\ -\not3x^2+\not3x^2-2x-6x=0\ \Rightarrow\ \\ \\ \ \Rightarrow\ -8x=0\ \Rightarrow\ x=0$