问题 选择题

(2011江苏泰州,3,3分)一元二次方程x2=2x的根是   

A.x=2

B.x="0"

C.x1="0," x2=2

D.x1="0," x2=-2

答案

答案:C

x2=2x,x2-2x=0,

x(x-2)=0,

x=0,x-2=0,

x1=0,x2=2,

故选:C.

单项选择题
单项选择题