不要复制粘贴在△ABC中C1,C2是AB边上的三等分点,A1,A2,A3是BC边上的四等分点.AA1与CC1交与点B1,CC2与C1A2交与点B2,计△AC1B1,△C1C2B2,△C2BA3的面积为S1,S2,S3.若S1+S3=9,S2=?只要告诉我为什么s1是ACC1的二分
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![不要复制粘贴在△ABC中C1,C2是AB边上的三等分点,A1,A2,A3是BC边上的四等分点.AA1与CC1交与点B1,CC2与C1A2交与点B2,计△AC1B1,△C1C2B2,△C2BA3的面积为S1,S2,S3.若S1+S3=9,S2=?只要告诉我为什么s1是ACC1的二分](/uploads/image/z/11031704-8-4.jpg?t=%E4%B8%8D%E8%A6%81%E5%A4%8D%E5%88%B6%E7%B2%98%E8%B4%B4%E5%9C%A8%E2%96%B3ABC%E4%B8%ADC1%2CC2%E6%98%AFAB%E8%BE%B9%E4%B8%8A%E7%9A%84%E4%B8%89%E7%AD%89%E5%88%86%E7%82%B9%2CA1%2CA2%2CA3%E6%98%AFBC%E8%BE%B9%E4%B8%8A%E7%9A%84%E5%9B%9B%E7%AD%89%E5%88%86%E7%82%B9.AA1%E4%B8%8ECC1%E4%BA%A4%E4%B8%8E%E7%82%B9B1%2CCC2%E4%B8%8EC1A2%E4%BA%A4%E4%B8%8E%E7%82%B9B2%2C%E8%AE%A1%E2%96%B3AC1B1%2C%E2%96%B3C1C2B2%2C%E2%96%B3C2BA3%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAS1%2CS2%2CS3.%E8%8B%A5S1%2BS3%3D9%2CS2%3D%3F%E5%8F%AA%E8%A6%81%E5%91%8A%E8%AF%89%E6%88%91%E4%B8%BA%E4%BB%80%E4%B9%88s1%E6%98%AFACC1%E7%9A%84%E4%BA%8C%E5%88%86)
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