问题
选择题
若
|
答案
∵
(lim x→1
)=1而(1-x)×2 1-x2
(lim x→1
-a 1-x
)=1得到b 1-x2
=(1-x)×2 1-x2
-a 1-x b 1-x2
解得:a=-2,b=-4.
故选C.
若
|
∵
(lim x→1
)=1而(1-x)×2 1-x2
(lim x→1
-a 1-x
)=1得到b 1-x2
=(1-x)×2 1-x2
-a 1-x b 1-x2
解得:a=-2,b=-4.
故选C.