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作者：
Белчева
GeoGebra
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Triangle with 3 Right Angles
Making New Year's resolutions for 2026
Exploring GeoGebra for the First Time
Shells
Volume by Shells Around y
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Blaise Carson - Isosceles Trapezoid
area between curve and x-axis
Cal I Upper Lower Sums
Trapezium Rule
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黎曼和（Riemann Sum）