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三角形ADC的高/三角形ABC的高=6/10 三角形ADC的面積/三角形ABC的面積 =三角形ADC的高/三角形ABC的高 =6/10 三角形ABD面積=三角形ABC的面積-三角形ADC的面積=4/10*三角形ABC的面積 三角形ABD和三角形ABC的面積之比=4/10=2/5
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