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导数含义探究（斜率）
Author:
xclzsh
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midpoint parallelogram display
Square Pretenders
BOTTLE_FINAL
AKH Normal Distribution of Theft Losses 2
The Doppler Effect (classic)
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Area entre dos curvas
Kite properties NDP
Investigate Parallelograms
Egg Constructions
Graficul funcției pătratice
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Exponent
Matrices
Median Line
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