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lim(x->2) (x^2-mx+8)/[x^2-(2+n)x +2n] =1/5 (0/0)
2^2-2m+8=0
2m=12
m=6
lim(x->2) (x^2-mx+8)/[x^2-(2+n)x +2n] =1/5
lim(x->2) (x^2-6x+8)/[x^2-(2+n)x +2n] =1/5 (0/0 分子分母分别求导)
lim(x->2) (2x-6)/[2x-(2+n)] =1/5
(4-6)/[4-(2+n)] =1/5
-10= 2-n
n=12
(m,n)=(6,12)
lim(x->2) (x^2-mx+8)/[x^2-(2+n)x +2n] =1/5 (0/0)
2^2-2m+8=0
2m=12
m=6
lim(x->2) (x^2-mx+8)/[x^2-(2+n)x +2n] =1/5
lim(x->2) (x^2-6x+8)/[x^2-(2+n)x +2n] =1/5 (0/0 分子分母分别求导)
lim(x->2) (2x-6)/[2x-(2+n)] =1/5
(4-6)/[4-(2+n)] =1/5
-10= 2-n
n=12
(m,n)=(6,12)
追问
为什么一开始设0/0型呢
追答
分母->0
分子一定要->0,否则极限不存在
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