August 2018 1 28 Report
5. Reducir:
(xy+1)(xy+7)+(xy+2)(xy–10)+2(3+xy)(3–xy)

8. Efectuar:
(x–3)3 – x3 + 27 disculpen es (x-3)ala 3 igual que x a la 3

10. Si: a+b=2
ab=3
Hallar: a3+b3 es a ala tres tambien b a la tres


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