问题
解答题
a为常数,若
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答案
∵
(lim x→+∞
-ax)x2-1
=lim x→+∞ x2-1-a2x2
+axx2-1
=lim x→+∞
=0,(1-a2)x2-1
+axx2-1
∴1-a2=0.
∴a=±1.
但a=-1时,分母→0,
∴a=1.
a为常数,若
|
∵
(lim x→+∞
-ax)x2-1
=lim x→+∞ x2-1-a2x2
+axx2-1
=lim x→+∞
=0,(1-a2)x2-1
+axx2-1
∴1-a2=0.
∴a=±1.
但a=-1时,分母→0,
∴a=1.