若，则必有（　　）. -题库考试答案搜索网

若，则必有（　　）.

单选题

2022-01-14 17:16

A、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/eacd1500-ab23-4e81-b173-2cc77ec8e952.png" width="65" height="19">
B、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/4015282f-7855-417c-ae5a-83bafcd9533d.png" width="65" height="19">
C、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/663c01d1-9307-479f-9894-1aa610843aa9.png" width="73" height="19">
D、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/b6324e8a-26e3-4d63-9386-716a11926e95.png" width="73" height="19">

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正确答案

D

试题解析

又

由以上二式得a=2,b=-8
本题用排除法更简单，在得到4+2a+b=0后即可排除A、B、C．

标签：考研公共课数学

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