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更新1:
Q2 sorry , I don't understand ! Would you mind solve this Q in another way ?
更新2:
Thank you , "forever" !
更新3:
(2) 方法1. 孟氏定理 (AN/NP) * ( PB/BC) * (CM/MA) = 1 (AN/NP) * ( 1/3)* (1/1) = 1 AN : NP = 3 : 1 ==> △BNP = (1/3) △ABN (同高△,面積比 = 底邊比 ) 方法2. 設 PC 中點為Q,連MQ △BNP中,MQ = 2NP △CAP中,AP = 2MQ = 4NP ==> AN = 3NP ==> △BNP = (1/3) △ABN (同高△,面積比 = 底邊比 ) nice job !!