Răspunsuri

2014-06-09T12:02:32+03:00
1.  x-√2=+-√2
x-√2=√2 => x=2√2
x-√2=-√2 =>x=0
2. (2a)²+2a*1+1²-(2a)²=2a+1
la 2. poti sami spui mai clar :D
In prima paranteza am folosit formula (a+b)²=a²+2ab+b²... a=2a si b=1.. => (2a)²+2a*1+1²... Rezulta (2a)²+2a*1+1²-(2a)²=(2a)²-(2a)²+2a*1+1²=0+2a+1=2a+1
Ai inteles?