: x2+5x+6=0, 2x+20=60, x2+4x+4=0, 5x+4=2x+7, (x+1)(x-1)=?, (x+3)2=?, (x-2)2=?, 3x+20=-7, Teorema lui Pitagora?, Elementele mulțimii A = {x| x ∈ Z, −2 ≤x≤ 5}, Elementele mulțimii M = {x| x∈ R, |x| ≤ 3}, sin 45°, tg 60°, cos 30°, 2+3(4+5)-2(3+1)=?,

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