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Problem1:(md+me+mf)/(ad+be+cf)=a
Author:
vinnyya
GeoGebra
New Resources
画直线等分三角形的面积
兩位數除以一位數（一）
球體建築師
球体的体积推导
判斷球體
Discover Resources
樣本大小與抽樣誤差
Addition and Subtraction of Polynomials 2 (多項式的加減法2)
最短距離
等截距和直線包絡拋物線
concyclic by Mr LO WY
Discover Topics
Conic Sections
Algebra
Correlation
Congruence
Geometric Transformations