求极限limx→5x^2-7x+10/x^2-5^2limx→5x^2-7x+10/x^2-5^2

Question

求极限 limx→5 x^2-7x+10/x^2-5^2
limx→5 x^2-7x+10/x^2-5^2

Answer 1

原式=lim(x-2)(x-5)/(x+5)(x-5)
=lim(x-2)/(x+5)
=3/10