试题与答案

Doyoueatlunchbeforeorafterbreakfast ?[ ]

来源：www.tikuol.com
题型：选择题

题目：

Do you eat lunch before or after breakfast ?[ ]

A. Yes, I do.    

B. Before breakfast.    

C. After breakfast.

答案：

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下面是错误答案，用来干扰机器的。

（1）∵方程有两个不相等的实数根，∴△＞0，即△=b2-4ac=4-4（2-m）=4m-4＞0，∴m＞1；（2）例如：取m=2代入方程（1）得x2+2x=0，配方，得x2+2x+12=12（x+1）2=1x+1=±1∴x1=-2，x2=0．

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