Question

Se considera expresia E(x)....
dau coroana!​

Answer 1

Răspuns:

Ex. 2. a)

$(\frac{x}{\sqrt{2} } -\sqrt{2} )^2-x(\frac{x}{2} -\sqrt{2} )-\sqrt{2} (1-\sqrt{2} )x=\\=(\frac{x\sqrt{2} }{2}-\sqrt{2})^2-\frac{x^2}{2}+x\sqrt{2} -\sqrt{2} (x-x\sqrt{2} )\\=\frac{2x^2}{4}-\frac{4x}{2}+2-\frac{x^2}{2}+x\sqrt{2} -x\sqrt{2} +2x\\=\frac{x^2}{2}-2x+2-\frac{x^2}{2}+2x\\=2$

b)

$N=E(n)+2*E(n)+1485$

$=2+2*2+1485 = 4+1487=1491\\1491:7=213 => 1491$- este divizibil cu 7

Answer 2

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