问题
填空题
若
|
答案
∵
(lim x→-∞
-x+k)=1，x2-x+1
∴
(lim x→-∞
-x+k)x2-x+1
=lim x→-∞ (
-x+k)(x2-x+1
+x-k) x2-x+1
+x-kx2-x+1
=lim x→-∞ (2k-1)x+1-k2
+x-kx2-x+1
=
=1，2k-1 2
∴k=
．3 2
故答案为
．3 2
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