题目内容
(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 |
C
x2=2x,x2-2x=0,
x(x-2)=0,
x=0,x-2=0,
x1=0,x2=2,
故选:C.
x(x-2)=0,
x=0,x-2=0,
x1=0,x2=2,
故选:C.
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