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Ajutati-ma va rog frumoos ,URGENT))))))

Ajutatima Va Rog Frumoos URGENT class=

Răspuns :

(x³+2x²-3x)/(x²+3x)=x(x²+2x-3)/x(x+3)=(x²-x+3x-3)/(x+3)=[x(x-1)+3(x-1)]/(x+3)=
=(x-1)(x+3)/(x+3)=x-1
x>0  x∈N    ⇒ x-1 ∈ N