jack_lu09 wrote:還有一題,我看的出來...(恕刪) 原題中,左邊那塊小三角形:2/3 * 1/3 = 2/9 註同理其他兩塊小三角形也各是 2/9故所求 = 1 - 2/9 - 2/9 - 2/9 = 1/3 #註