其开口方向形状与抛物线y=x^2完全相同
a=1
顶点M坐标是(2,-1)
对称轴为
x=2
于是
-b/2=2
b=-4
y=x^2-4x+c
再把(2,-1)代入
c=3
y=x^2-4x+3
抛物线与x轴交于A
y=x^2-4x+3=0
x=3或1
(3,0)(1,0)
已知抛物线y=ax^2+bx+c的顶点M坐标是(2,-1),其开口方向形状与抛物线y=x^2完全相同,抛物线与x轴交于A,B
已知抛物线y=ax^2+bx+c的顶点M坐标是(2,-1),其开口方向形状与抛物线y=x^2完全相同,抛物线与x轴交于A,B
数学人气:767 ℃时间:2019-12-14 13:06:27
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