中学生网络课堂
初三数学 (通用版上册)
二次函数综合
本课配套习题挑战模式1/5
单选题
难度系数：
1.定义：若抛物线的顶点与x轴的两个交点构成的三角形是直角三角形，则这种抛物线就称为：“美丽抛物线”. 如图，直线l：y=
x+b经过点M（0，
），一组抛物线的顶点B1（1，y1），B2（2，y2），B3（3，y3），…Bn（n，yn）（n为正整数），依次是直线l上的点，这组抛物线与x轴正半轴的交点依次是：A1（x1，0），A2（x2，0），A3（x3，0），…An+1（xn+1，0）（n为正整数）. 若x1=d（0＜d＜1），当d为（ ）时，这组抛物线中存在美丽抛物线. 
x+b经过点M（0，），一组抛物线的顶点B1（1，y1），B2（2，y2），B3（3，y3），…Bn（n，yn）（n为正整数），依次是直线l上的点，这组抛物线与x轴正半轴的交点依次是：A1（x1，0），A2（x2，0），A3（x3，0），…An+1（xn+1，0）（n为正整数）. 若x1=d（0＜d＜1），当d为（ ）时，这组抛物线中存在美丽抛物线. A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOeUseaKm+eJqee6v+eahOWvueensOaAp+WPr+efpe+8jOaJgOaehOaIkOeahOebtOinkuS4ieinkuW9ouW/heaYr+S7peaKm+eJqee6v+mhtueCueS4uuebtOinkumhtueCueeahOetieiFsOS4ieinkuW9ou+8jOaJgOS7peatpOetieiFsOS4ieinkuW9ouaWnOi+ueS4iueahOmrmOetieS6juaWnOi+ueeahOS4gOWNii4g5Y+IMO+8nGTvvJwx77yM5omA5Lul562J6IWw55u06KeS5LiJ6KeS5b2i5pac6L6555qE6ZW/5bCP5LqOMu+8jOaJgOS7peetieiFsOebtOinkuS4ieinkuW9ouaWnOi+ueeahOmrmOS4gOWumuWwj+S6jjHvvIzljbPmipvniannur/nmoTlrprngrnnurXlnZDmoIflv4XlrprlsI/kuo4xLg==
- 答案：Qg==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.如图，已知点A1，A2，…，A2011在函数y=x2位于第二象限的图象上，点B1，B2，…，B2011在函数y=x2位于第一象限的图象上，点C1，C2，…，C2011在y轴的正半轴上，若四边形OA1C1B1、C1A2C2B2，…，C2010A2011C2011B2011都是正方形，则正方形C2010A2011C2011B2011的边长为（ ）
| A: 2010 |
| B: 2011 |
C: 2010 |
| D: 2011 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruato+aWueW9ouWvueinkue6v+W5s+WIhuS4gOe7hOWvueinkuWPr+W+l09CPHN1Yj4xPC9zdWI+5LiOeei9tOeahOWkueinkuS4ujQ1wrDvvIznhLblkI7ooajnpLrlh7pPQjxzdWI+MTwvc3ViPueahOino+aekOW8jw==
- 提示2：IOWGjeS4juaKm+eJqee6v+ino+aekOW8j+iBlOeri+axguWHuueCuUI8c3ViPjE8L3N1Yj7nmoTlnZDmoIfvvIznhLblkI7msYLlh7pPQjxzdWI+MTwvc3ViPueahOmVvw==
- 提示3：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
- 答案：RA==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.二次函数y＝
x2的图象如图所示，点A0位于坐标原点，点A1，A2，A3，…，A2008在y轴的正半轴上，点B1，B2，B3，…，B2008在二次函数y＝x2位于第一象限的图象上，若△A0B1A1，△A1B2A2，△A2B3A3，…，△A2009B2010A2010都为等边三角形，则△A2009B2010A2010的周长为（ ）
x2的图象如图所示，点A0位于坐标原点，点A1，A2，A3，…，A2008在y轴的正半轴上，点B1，B2，B3，…，B2008在二次函数y＝x2位于第一象限的图象上，若△A0B1A1，△A1B2A2，△A2B3A3，…，△A2009B2010A2010都为等边三角形，则△A2009B2010A2010的周长为（ ） | A: 2009 |
| B: 2010 |
| C: 6024 |
| D: 6030 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOeUseS6juKWs0E8c3ViPjA8L3N1Yj5CPHN1Yj4xPC9zdWI+QTxzdWI+MTwvc3ViPu+8jOKWs0E8c3ViPjE8L3N1Yj5CPHN1Yj4yPC9zdWI+QTxzdWI+Mjwvc3ViPu+8jOKWs0E8c3ViPjI8L3N1Yj5CPHN1Yj4zPC9zdWI+QTxzdWI+Mzwvc3ViPu+8jOKApu+8jOmDveaYr+etiei+ueS4ieinkuW9ou+8jOWboOatpOKIoEI8c3ViPjE8L3N1Yj5BPHN1Yj4wPC9zdWI+eD0zMMKw77yM5Y+v5YWI6K6+5Ye64pazQTxzdWI+MDwvc3ViPkI8c3ViPjE8L3N1Yj5BPHN1Yj4xPC9zdWI+55qE6L656ZW/77yM54S25ZCO6KGo56S65Ye6QjxzdWI+MTwvc3ViPueahOWdkOagh++8jOS7o+WFpeaKm+eJqee6v+eahOino+aekOW8j+S4reWNs+WPr+axguW+l+KWs0E8c3ViPjA8L3N1Yj5CPHN1Yj4xPC9zdWI+QTxzdWI+MTwvc3ViPueahOi+uemVvw==
- 提示2：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
- 答案：RA==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.如图，记抛物线y=-x2+1的图象与x正半轴的交点为A，将线段OA分成n等份，设分点分别为P1，P2，…Pn-1，过每个分点作x轴的垂线，分别与抛物线交于点Q1，Q2，…，Qn-1，再记直角三角形OP1Q1，P1P2Q2，…，Pn-2Pn-1Qn-1的面积分别为S1，S2，…，这样就有S1=
，S2=
，…；记W=S1+S2+…+Sn-1，当n越来越大时，你猜想W最接近的常数是（ ）
，S2=，…；记W=S1+S2+…+Sn-1，当n越来越大时，你猜想W最接近的常数是（ ） A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：IOWIqeeUqOWeguebtOadoeS7tuaxguWHuumrmO+8jOWwseWPr+S7peaKik9QPHN1Yj4xPC9zdWI+UTxzdWI+MTwvc3ViPu+8jFA8c3ViPjE8L3N1Yj5QPHN1Yj4yPC9zdWI+UTxzdWI+Mjwvc3ViPu+8jOKApueahOmdouenr+ihqOekuuWHuuadpe+8jOaJvuWHuuinhOW+i++8jOWGmeWHulM8c3ViPm08L3N1Yj7nmoTooajovr7lvI/lho3msYLlkozvvIzmnIDlkI7lvZNu5b6I5aSn5pe277yM5rGC5Ye6V+acgOaOpei/keeahOW4uOaVsC4=
- 答案：Qw==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.如图已知A1，A2，A3，…An是x轴上的点，且OA1=A1A2=A2A3=A3A4=…=An-1An=1，分别过点A1，A2，A3，…An′作x轴的垂线交二次函数y=
x2（x＞0）的图象于点P1，P2，P3，…Pn，若记△OA1P1的面积为S1，过点P1作P1B1⊥A2P2于点B1，记△P1B1P2的面积为S2，过点P2作P2B2⊥A3P3于点B2，记△P2B2P3的面积为S3，…依次进行下去，最后记△Pn-1Bn-1Pn（n＞1）的面积为Sn，则Sn=（ ）
x2（x＞0）的图象于点P1，P2，P3，…Pn，若记△OA1P1的面积为S1，过点P1作P1B1⊥A2P2于点B1，记△P1B1P2的面积为S2，过点P2作P2B2⊥A3P3于点B2，记△P2B2P3的面积为S3，…依次进行下去，最后记△Pn-1Bn-1Pn（n＞1）的面积为Sn，则Sn=（ ） A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOaKing9buWSjHg9bi0x5Luj5YWl5LqM5qyh5Ye95pWw5rGC5Ye6eeeahOWAvO+8jOWNs+WPr+axguWHuuS4ieinkuW9oueahOi+uemVv++8jOagueaNrumdouenr+WFrOW8j+iuoeeul+WNs+WPrw==
- 答案：QQ==
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
