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rbD 896
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《山歌好比春江水》斯琴格日乐、臧天朔原唱MT种子下载地址：thunder://QUFodHRwOi8vYWlrYW5keS5vcmcv44CK5bGx5q2M5aW95q+U5pil5rGf5rC044CL5pav55C05qC85pel5LmQ44CB6Ien5aSp5pyU5Y6f5ZSxTVRbd3d3Lld5bXA0Lm5ldF0uYXZpP2ZpZD1lR2w3dGswQWJMREdWOGhXcVQ0WnNxYkJ2Z2NBQUFBQUFBQUFBQUFBQU...
连接OD、OE、OF设半径为r则AD=AE=AC-r= 3-rBD=BF= BC-r= 5-r所以AB=AD+BD=8-2r根据勾股定理 AC^2 +BC^2= AB^2,有3^2 +5^2 =(8-2r)^2即可求出r