等价无穷小代换 定理2(等价无穷小代换定理) 设a~aB~且lm存在则im5=hm2 c c 证imB=lm.B.) CC ββ c c c c二、等价无穷小代换 定理２(等价无穷小代换定理) ~ , ~ lim , lim lim .   =     设    且 存 在 则 证   lim lim( )         =         = lim lim lim lim .   =