有甲、乙两张纸条,甲纸条的宽是乙纸条宽的2倍,如图(4)。将这

有甲、乙两张纸条,甲纸条的宽是乙纸条宽的2倍,如图(4)。将这两张纸条交叉重叠地放在一起,重合部分为四边形,则的数量关系为           .

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