Question

1)Scrie ca patratul unui binom expresia 3+2√2
2)Alege din elementele multimii {-√2;0;2;√2} solutiile ecuatiei 2x+1-2=1+x
3)O banca acorda 4% dobanda lunara.Aflati ce suma initiala a depus alexandra daca dupa doua luni avea in cont 21632 lei.
Dau coroana

Answer 1

1) 3+2√2=2+1+2√2 = (√2+1)²
2) 2x+1-2=1+x
     2x-1=1+x
      2x-x=1+1
        x=2
Singura solutie este 2.
3)a= suma initiala
a+4/100 *a+ 4/100(a+4/100 *a)=21632
a+a/25+1/25(a+a/25)=21632
26a/25+26a/625=21632 | *625
650a+26a=13.520.000
676a=13.520.000
a=20.000 lei