October 2018 1 12 Report
1. Efectuar (1+x)(x–1) – (4+x)(x–4) 2. Efectuar (2+x)(x+8) – (5+x)2 3. Efectuar (5x+1)2 + (5x–1)2 – 50 x2 4. Efectuar (x+5)2 – (x–5)2 – 20x 5. Efectuar (x2 + 4)(x+2)(x–2) – x4
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