题目

形如：的函数叫二次函数，它的图象是一条抛物线．类比一元一次方程的解可以看成两条直线的交点的横坐标；则一元二次方程的解可以看成抛物线与直线（轴）的交点的横坐标；也可以看成是抛物线与直线________的交点的横坐标；也可以看成是抛物线________与直线的交点的横坐标． 答案：【答案】 【解析】一元二次方程+x－3=0可变形为=－x+3，或者－3=－x，故一元二次方程+x－3=0可以看成是抛物线y=与直线y=－x+3的交点的横坐标；也可以看成是抛物线y=－3与直线y=－x的交点的横坐标．根据题意可得：可以看成是抛物线y=与直线y=－x+3的交点的横坐标；也可以看成是抛物线y=－3与直线y=－x的______ after the race that he didn't know what to say before so many reporters. [     ]A. So excited the champion was B. So excited was the champion C. So excited the champion felt D. So excited felt the champion