when 3,5,14 are added to a number,then the twice of the sum of first and third number is lager than second number by121.find the number.
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ab是圆o的直径弦cd垂直于ab于点g点f是cd上一点满足cf/fd=1/3连接af并延长交圆o于点e连结adde若cf＝2af＝3 求证s三角形def＝4根号5
AB为圆O的直径,D是弧BC中点,DE垂直于AC交AC延长线于E,圆O的切线BF交AD的延长线于F若DE为3圆O半径为5求ADDE为切线
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