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正三角形的面積
Author:
李春培
正三角形的面積
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
兩位數除以一位數（一）
異分母分數減法
兩位數加法
Discover Resources
等積的正方形與正三角形
Multiplication of Polynomials(多項式的乘法)
HW question locus 3
Angles in Alternate Segment
桃子Peach
Discover Topics
Limits
Kite
Indefinite Integral
Fractions
Scalene Triangles