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三角形的面積=底*高/2 6.4*h/2=6.4 h=2 平行四邊形與三角形等高 平行四邊形面積=底邊*高 =(3.6+6.4)*2 =20 梯形面積=平行四邊形面積-三角形面積 =20-6.4 =13.6平方分米
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