推 huang419 :your skill are superior 02/19 20:04
推 ccccc7784 :原來如此!!感謝 02/22 16:55
※ 引述《ccccc7784 (龍王號)》之銘言：
: 題目如下
: http://imm.io/WIsb
: 感謝
AE:EC= 6:7 => ΔAIE = 6 ,ΔIEC = 7
AC:BC = 5:7 = ΔAIC:ΔBIC = 13 : ΔBIC ,=>ΔBIC = 91/5
AB:AC = 6:5 = BD:DC =ΔBID:ΔDIC ,=>ΔDIC = (91/5)(5/11) = 91/11
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