6.    探索直线平行的条件（1）

http://math.cersp.com/DataBank/CC/kj/200711/5829.html

7.    认识百万分之一

http://math.cersp.com/DataBank/CC/kj/200711/5828.html

8.    平面直角坐标系（1）

http://math.cersp.com/DataBank/CC/kj/200711/5827.html

9.    摸到红球的概率

http://math.cersp.com/DataBank/CC/kj/200711/5824.html

10.变化中的三角形

http://math.cersp.com/DataBank/CC/kj/200711/5821.html

11.探索多边形内角和

http://math.cersp.com/DataBank/CC/kj/200711/5820.html

12.结识抛物线

http://math.cersp.com/DataBank/CC/kj/200711/5819.html

13.鸡兔同笼

http://math.cersp.com/DataBank/CC/kj/200711/5818.html

14.何时获得最大利润

http://math.cersp.com/DataBank/CC/kj/200711/5817.html

15.中位数与众数

http://math.cersp.com/DataBank/CC/kj/200711/5811.html

16.比较线段的长短

http://math.cersp.com/DataBank/CC/kj/200711/5812.html

http://math.cersp.com/DataBank/CC/kj/200711/5813.html

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