函数,请问这样的题怎么做,求指点
2个回答
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(a)
lim(x->-∞) 3x^(-2)
=lim(x->-∞) 3/x^2
=0
(b)
lim(x->∞) -(1/2)x^(3/2) -> -∞
(c)
lim(x->∞) (3x^2-5x +7) ->+∞
(d)
lim(x->-∞) ( 7x^2 -9x^3) ->+∞
(e)
lim(x->-∞) (4x-3x^2)/(4x^2+3x)
=lim(x->-∞) (4/x- 3)/(4+3/x)
=-3/4
(f)
lim(x->∞) (1-x)(2+3x)/(2x^2+1)
=lim(x->∞) (1/x-1)(2/x +3)/(2+1/x^2)
=-3/2
lim(x->-∞) 3x^(-2)
=lim(x->-∞) 3/x^2
=0
(b)
lim(x->∞) -(1/2)x^(3/2) -> -∞
(c)
lim(x->∞) (3x^2-5x +7) ->+∞
(d)
lim(x->-∞) ( 7x^2 -9x^3) ->+∞
(e)
lim(x->-∞) (4x-3x^2)/(4x^2+3x)
=lim(x->-∞) (4/x- 3)/(4+3/x)
=-3/4
(f)
lim(x->∞) (1-x)(2+3x)/(2x^2+1)
=lim(x->∞) (1/x-1)(2/x +3)/(2+1/x^2)
=-3/2
追问
你好请问可以解释一下C和D吗谢谢!
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