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陰影面積大概是除了梯形以外的面積吧. 設長方形的長是a,寬是b,則有:a*b=70 梯形的上底長是:3a/7,下底長是:4a/5,高是:b 那麼梯形的面積是:(3a/7+4a/5)*b/2=43/70*ab=43/70*70=43 那麼陰影面積是:70-43=27
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