题目

设x1为一元二次方程2x2﹣4x=较小的根，则（ ）A. 0＜x1＜1 B. ﹣1＜x1＜0 C. ﹣2＜x1＜﹣1 D. ﹣5＜x1＜﹣ 答案：【答案】B【解析】先求出方程的解，再求出方程的最小值，即可求出答案．2x2-4x=，8x2-16x-5=0，x=，∵x1为一元二次方程2x2-4x=较小的根，∴x1=，∵5＜＜6，∴-1＜x1＜0．故选B．—Is there any particular soup you would like to have? —_______ you select is all right with me. A．Whatever B．Anything C．No matter what D．Whichever