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重难题组周练（1）——二次函数
Author:
程洁
Topic:
Quadratic Functions
GeoGebra
New Resources
小数 的副本
近似值：有效數字
四邉形 (四年級) 教師版
Fibonacci Clock
兩組對邊相等的四邊形
Discover Resources
三角形重心
Area of triangle using 0.5bs sinA
version 1
加減併式與估算
蚂蚁爬行
Discover Topics
Right Triangles
Arithmetic
Bar Chart or Bar Graph
General Quadrilateral
Means