A. a = 2,b = 8 B. a = 2,b = 5 C. a = 0,b = -8 D. a = 2,b = -8D正确答案是D。提示：当x→

书海库2020-05-20 44

问题

选项 A. a = 2,b = 8B. a = 2,b = 5C. a = 0,b = -8D. a = 2,b = -8

答案D

解析正确答案是D。提示：当x→2,分母极限为零，分子也必须为零，故有4 + 2a + b = 0;利用洛必达法则，[img]/upload/tiku/138/331721_1.jpg[/img]所以a=2，代入4 + 2a + b= 0有b=-8。

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A. a = 2,b = 8 B. a = 2,b = 5 C. a = 0,b = -8 D. a = 2,b = -8D正确答案是D。 提示：当x→