解方程:5x+2=3x2.
由原方程,得
3x2-5x-2=0,
∴(x-2)(3x+1)=0,
∴x-2=0,或3x+1=0
解得,x=2,或x=-13.
---I for London to attend a meeting tomorrow. The plane at 10:20 am.
---Have a good journey!
A.am leaving; leaves
B.leave; leaves
C.am leaving; is leaving
D.leave; is leaving
()适用于大量标准化、周期较短的以体力活动为主的工作。
A.主管人员分析法
B.访谈分析法
C.问卷调查分析法
D.观察分析法