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梯形ABCD中,∵AD‖BC,∴△ABD的面積與△ACD的面積相等,隨之有△AOB的面積與△COD的面積相等,記這兩三角形的面積均為S1,又記△AOD的面積為S2,△BOC的面積為S3,梯形的總面積為S,另設AD=a,BC =b.熟知△AOD∽△BOC,其相似…
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