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练习（点，斜率，直线）
Author:
朱亮
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فاصله نقطه از خط
Ripple Effect
قضیه تالس
تقارن مرکزی
مقاطع مخروطی
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Square - measurements
Notes November 20
Start, Copy Segment
Shaking the stage!
t/t^2 + 4 slope field
Discover Topics
Exponent
Inequalities
Cuboid
Quadrilaterals
Matrices