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做這個類題目有個技巧,你看3/a=4/b=5/c是不是很想讓 a= 3,b =4,c =5?但是嚴謹一點要這樣,設 a = 3t ,那麼b =4t,c =5t ,這樣一來,帶入式子就可以求出來啦. ( 3t x 4t - 4t x 5t -3t x 5t ) / ( .) 電腦打很辛苦,這個還是手寫快.我就省略啦.最後 t 都約掉了.
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