x3-3x2+2x=0.
原方程变形得:x(x2-3x+2)=0,
x(x-1)(x-2)=0,
∴方程的根为:x1=0、x2=1、x3=2.
All of ______ sudden someone shouted, “It is time to put ______ end to the meeting.”
A.a;an
B.a; /
C./; an
D./; /
防止火灾的基本措施包括控制可燃物,隔绝空气,消除着火源,阻止火势蔓延。