挑战习题
1
/5
单选题
难度:
1.二次函数y=ax
2
+bx+c图象上部分点的坐标满足下表:
x
…
-3
-2
-1
0
1
…
y
…
-3
-2
-3
-6
-11
…
则该函数图象的顶点坐标为()
A
(-3,-3)
B
(-2,-2)
C
(-1,-3)
D
(0,-6)
提示1:
IOagueaNruS6jOasoeWHveaVsOeahOWvueensOaAp+ehruWumuWHuuS6jOasoeWHveaVsOeahOWvueensOi9tO+8jOeEtuWQjuino+etlOWNs+WPry4=
正确答案:
Qg==
6Kej77ya4oi1eD0tM+WSjC0x5pe255qE5Ye95pWw5YC86YO95pivLTPnm7jnrYnvvIw8YnI+4oi05LqM5qyh5Ye95pWw55qE5a+556ew6L205Li655u057q/eD0tMu+8jDxicj7iiLTpobbngrnlnZDmoIfkuLrvvIgtMu+8jC0y77yJLiA8YnI+5pWF6YCJQi4g
2
/5
单选题
难度:
2.已知二次函数的图象经过A(-1,0)、B(3,0),且函数有最小值-8,则二次函数的顶点坐标( )
A
(2,-8)
B
(1,-8)
C
(1,8)
D
(0,8)
提示1:
IOagueaNruWvueensOaAp+WPr+efpeWvueensOi9tA==
正确答案:
Qg==
6Kej77ya4oi15LqM5qyh5Ye95pWw55qE5Zu+6LGh57uP6L+HQe+8iC0x77yMMO+8ieOAgULvvIgz77yMMO+8iTxicj7moLnmja7lr7nnp7DmgKflj6/lvpflr7nnp7DovbR4PTE8YnI+5Y+I4oi15Ye95pWw5pyJ5pyA5bCP5YC8LTg8YnI+4oi06aG254K55Z2Q5qCH5Li677ya77yIMe+8jC0477yJ
3
/5
单选题
难度:
3.
抛物线y=a(x+1)
2
+2的一部分如图所示,该抛物线在y轴右侧部分与x轴交点的坐标是( )
A
(
)
B
(1,0)
C
(2,0)
D
(3,0)
提示1:
PHA+5Zug5Li65oqb54mp57q/eT1h77yIeCsx77yJPHN1cD4yPC9zdXA+KzLnmoTlr7nnp7DovbTkuLp4PS0x77yM5qC55o2u5a+556ew6L20eD0tMeWPiuWbvuixoeS4jnjovbTnmoTkuIDkuKrkuqTngrk8L3A+
提示2:
PHA+77yILTPvvIww77yJ5Y+v5rGC5Y+m5LiA5Liq5Lqk54K5LjwvcD4=
正确答案:
Qg==
PHA+6Kej77ya5Zug5Li65oqb54mp57q/eT1h77yIeCsx77yJPHN1cD4yPC9zdXA+KzLnmoTlr7nnp7DovbTkuLp4PS0x77yMPGJyPuaKm+eJqee6v+S4jnjovbTnmoTkuIDkuKrkuqTngrnvvIgtM++8jDDvvInvvIzmoLnmja7lr7nnp7DmgKfvvIw8YnI+5oqb54mp57q/5LiOeOi9tOeahOS4gOS4quS6pOeCue+8iDHvvIww77yJ77yMPGJyPuaVhemAiUIuPC9wPg==
4
/5
单选题
难度:
4.已知抛物线y=ax
2
-4ax+h(a≠0)与x轴交于A(x
1
,0),B(3,0)两点,则线段AB的长度为( )
A
1
B
2
C
3
D
4
提示1:
IOWFiOaxguWHuuaKm+eJqee6v+eahOWvueensOi9tO+8jOWGjeagueaNrkHvvIh4PHN1Yj4xPC9zdWI+77yMMO+8ieS4jkLvvIgz77yMMO+8ieWFs+S6juebtOe6v3g9MuWvueensO+8jOaxguWHukHngrnnmoTlnZDmoIfvvIzljbPlj6/lvpflh7rnrZTmoYgu
正确答案:
Qg==
6Kej562U77ya4oi1eT1heDxzdXA+Mjwvc3VwPi00YXgraO+8iGHiiaAw77yJ55qE5a+556ew6L205piv77yaeD0y77yMPGJyPuKItEHvvIh4PHN1Yj4xPC9zdWI+77yMMO+8ieS4jkLvvIgz77yMMO+8ieWFs+S6juebtOe6v3g9MuWvueensO+8jDxicj7iiLRB54K555qE5Z2Q5qCH5piv77ya77yIMe+8jDDvvInvvIw8YnI+4oi057q/5q61QULnmoTplb/luqY9My0xPTLvvJs8YnI+5pWF6YCJQi4g
5
/5
单选题
难度:
5.老师出示了小黑板上的题后(如图),小华说:过点(3,0);小彬说:过点(4,3);小明说:a=1;小颖说:抛物线被x轴截得的线段长为2. 你认为四人的说法中,正确的有( )个。
A
1
B
2
C
3
D
4
提示1:
IOagueaNruWbvuS4iue7meWHuueahOadoeS7tuaYr+S4jnjovbTkuqTkuo7vvIgx77yMMO+8ie+8jOWPq+aIkeS7rOWKoOS4quadoeS7tuS9v+WvueensOi9tOaYr3g9Mu+8jOaEj+aAneWwseaYr+aKm+eJqee6v+eahOWvueensOi9tOaYr3g9MuaYr+mimOebrueahOW3suefpeadoeS7tu+8jOi/meagt+WPr+S7peaxguWHumHjgIFi55qE5YC877yM54S25ZCO5Y2z5Y+v5Yik5pat6aKY55uu57uZ5Ye65Zub5Liq5Lq655qE5Yik5pat5piv5ZCm5q2j56GuLg==
正确答案:
Qw==
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