回復 40# anyway13 的帖子
L.
圓內接四邊形\(ABCD\),\(\overline{AC}\)交\(\overline{BD}\)於\(M\),\(\overline{CD}=2\),\(\overline{AD}=4\),\(\overline{BC}=8\),\(\overline{AB}=5\),試問\(\overline{AM}:\overline{CM}\)的比值為 。
[提示]
△CMB~△DMA ,△CMD~△BMA
CM:DM = CB:DA = 8:4
AM:DM = BA:CD = 5:2