[中學] 科學班題目
請教一題科學班的題目
三個兩兩相外切的圓,均內切於一個大圓(如圖),此三個圓
半徑分別為6、9、30,則最外面的大圓半徑為_______
http://ppt.cc/Oq62
裡面的第七題謝謝
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