1.已知5+根号下7的小数部分为a,5-根号下7的小数部分为b.求a+b的值.2.已知2009-a的绝对值+根号下a-2010=a ,求a-2009^2的值.3.在△ABC中,∠B=90°,两直角边AB=60,BC=80,三角形内有一点P到各边的距离相等,求
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![1.已知5+根号下7的小数部分为a,5-根号下7的小数部分为b.求a+b的值.2.已知2009-a的绝对值+根号下a-2010=a ,求a-2009^2的值.3.在△ABC中,∠B=90°,两直角边AB=60,BC=80,三角形内有一点P到各边的距离相等,求](/uploads/image/z/1260030-30-0.jpg?t=1.%E5%B7%B2%E7%9F%A55%2B%E6%A0%B9%E5%8F%B7%E4%B8%8B7%E7%9A%84%E5%B0%8F%E6%95%B0%E9%83%A8%E5%88%86%E4%B8%BAa%2C5-%E6%A0%B9%E5%8F%B7%E4%B8%8B7%E7%9A%84%E5%B0%8F%E6%95%B0%E9%83%A8%E5%88%86%E4%B8%BAb.%E6%B1%82a%2Bb%E7%9A%84%E5%80%BC.2.%E5%B7%B2%E7%9F%A52009-a%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%2B%E6%A0%B9%E5%8F%B7%E4%B8%8Ba-2010%3Da+%2C%E6%B1%82a-2009%5E2%E7%9A%84%E5%80%BC.3.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0B%3D90%C2%B0%2C%E4%B8%A4%E7%9B%B4%E8%A7%92%E8%BE%B9AB%3D60%2CBC%3D80%2C%E4%B8%89%E8%A7%92%E5%BD%A2%E5%86%85%E6%9C%89%E4%B8%80%E7%82%B9P%E5%88%B0%E5%90%84%E8%BE%B9%E7%9A%84%E8%B7%9D%E7%A6%BB%E7%9B%B8%E7%AD%89%2C%E6%B1%82)
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