如果x-3是多项式2x2-5x+m的一个因式,则m等于( )
A.6
B.-6
C.3
D.-3
把x=3代入方程2x2-5x+m=0中得18-15+m=0,解得:m=-3.
故选D.
The government has___________a series of policies and measures to ensure the improvement in living standards.
A.put out
B.put off
C.put forward
D.put down
无止痛作用的物理治疗是()
A.超短波
B.激光
C.紫外线
D.被动运动
E.推拿