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電風扇
Author:
JE
GeoGebra
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異分母分數減法
兩位數除以一位數（一）
四邊形的特性
拼砌四邊形
球體建築師
Discover Resources
球面與截平面的關係
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
角的認識
中位线的副本
Fractal
Discover Topics
Multiplication
Integers
Pie Chart or Circle Chart
Sphere
Algebra