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Algebra:
1)DVA  7x/x^2-25
2)x²-2/3x+1          a)x=2    b)x=√3

3)Simplificare 
a)x^2+36/x^2+12x+36
b)x^2-16/x^2-8x+16

Răspuns :

1)7x/x²-25=7x/(x-5)(x+5)
2) (x²-2)/(3x+1)
a) pt.x=2⇒(2²-2)/(3·2+1)⇒2/7
b) ptx=√3⇒raportul =(√3²-2)/3√3+1)=(3-2)/(3√3+1)=1/3√3+1
3)x²+36/(x+6)(x+6)=(x²+36)/(x+6)²
b)(x²-16)/(x²-8x+16)=(x-4)(x+4)/(x-4)(x-4)=(x+4)/(x-4)

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