____ (失业) for two years because of my sickness, I decided to look for a part-time job.
二次函数y=2x2﹣4x﹣1的顶点式是( )
解二元一次方程组的方法有代入消元法和____ 消元法,化二元为一元.
根据要求,回答下面1-2题。