If the base of a triangle is twice the base of the parallelogram and the area is equal to the area of the parallelogram, then how many times the height of the parallelogram is the height of the triangle.
一个三角形的底是平行四边形底的2倍，面积和平行四边形面积相等，那么平行四边形的高是三角形高的多少倍．
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