Математики, помогите плиз с пределами 
1. Lim √(1+x)-1÷x


x⇒0


2. Lim(2x²-3x-5)÷(1+x+3x²)


x⇒0


3. Lim(2x²-3x-5)÷(1+x+3x²)=∞÷∞=(*)


x⇒∞


4. Lim(7x³+15x²+9x+1)÷(5x^4+6x²-3x-4)=∞÷∞=(*)


x⇒
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