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3.Multimea solutiilor ecuatiei 2x*2-5x+2=0 este:

Răspuns :

2x·2-5x+2=0 => 4x-5x+2=0 => -x+2=0 => -x=0-2 => -x=-2 => x=2
S={2;-2}

2x²-5x+2=0(2x-1)(x-2)=0
2x-1=0    ⇒ x=1/2

x-2=0      
⇒ x=2