1) (a+b)2 = ? a) a2 + 2ab + b2 b) a2 + b2 c) a2 - b2 d) 2a + ab + 2b 2) a*b = b*a a) adevarat b) fals 3) a2 - b2 = ? a) (a - b)(a - b) b) (a + b)(a + b) c) (a - b)(a + b) 4) x2 - 5x + 6 = 0 ,  Δ = ? a) 4 b) 2 c) 1 d) 0 5) x2 - 5x + 6 = 0 , x1 = ? , x2 = ? a) 2 b) 0 c) 3 d) 4 6) 2 * (2 + 2) = ? a) 1977 b) 6 c) 2 cos (2 * pi * f + t) d) 8

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