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1、2012 郑州市数学第一次质量检测备考练习郑州市数学第一次质量检测备考练习一、填空题一、填空题(共共 2 道，每道道，每道 20 分分) 1.2009 年 10 月 8 日晚，河南安阳的一位彩民创造了中国彩票史之最，因为他中了 3.59 亿 元巨奖，如果扣除 20%的税收后，他仍然能够得到约_元（保留三个有效数字，结 果用科学记数法表示） 2.如图，将一个边长分别为 4，8 的长方形纸片 ABCD 折叠，使 C 点与 A 点重合，则折痕 EF 的长是二、解答题二、解答题(共共 2 道，每道道，每道 30 分分)1.先化简，然后从2x2 的范围内选取一个合适的整数作为 x 的值代入求值2.如图，
2、直线与反比例函数的图象交于 A，B两点.（1）求、的值；（2）直接写出时 x 的取值范围； （3）如图，等腰梯形 OBCD 中，BC/OD，OB=CD，OD 边在 x 轴上，过点 C 作 CEOD 于点 E，CE 和反比例函数的图象交于 点 P，当梯形 OBCD 的面积为 12 时，请判断 PC 和 PE 的大小关系，并说明理由内部资料，请勿外传！9JWKffwvG#tYM*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ!djs#XuyUP2kNXpRWXmA&UE9aQGn8xp$R#͑GxGjqv$UE9wEwZ#QcUE%&qYpEh5pD
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