c/a0时,图象开口向上,点C在原点下面,c0)
OC^2=c^2
c^2=-c/a
ac=-1
有什么疑问吗?
抛物线y=ax^2+bx+c与x轴交点是A,B两点,与y轴交于点C,若ABC是直角三角形……
抛物线y=ax^2+bx+c与x轴交点是A,B两点,与y轴交于点C,若ABC是直角三角形……
抛物线y=ax^2+bx+c与x轴交点是A,B两点,与y轴交于点C,若ABC是直角三角形则ac=
由于ABC是直角三角形,所以抛物线与x轴的交点必然在x轴两边
所以【c/a
抛物线y=ax^2+bx+c与x轴交点是A,B两点,与y轴交于点C,若ABC是直角三角形则ac=
由于ABC是直角三角形,所以抛物线与x轴的交点必然在x轴两边
所以【c/a
数学人气：555 ℃时间：2019-08-20 13:43:27
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