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hjzx123456
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GeoGebra
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錐體建築師
兩位數除以一位數(一)
四邊形的特性
三位數除以一位數(二)
球體建築師
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已知橢圓 x^2/a^2+y^2/b^2=1 (a>b>0)
sinα + sinβ > 0 ?
量角器
橢圓1--四圓心近似法
达芬奇椭圆仪
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Integral Calculus
Subtraction
Quadrilaterals
Equations
Correlation