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因為圖1的面積+圖2的面積-圖2的面積+圖3的面積,所以:圖3的面積=圖1的面積,圖1是一個梯形,上底是12釐米,下底是12-3=9(釐米),該梯形的高是6釐米,所以陰影面積也就是圖1的面積是:(12+ 9)×6÷2=21×6÷2=126÷2=63(平方釐米)答:陰影部分的面積是63平方釐米.
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