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若点O是平行四边形ABCD对角线的交点,过O点任作一条直线a,则直线a将平行四边形ABCD平分成全等的两部分(面积相等),并说明它在解题中的应用.
If the point O is the intersection of the ABCD diagonal of the parallelogram, and the point O is taken as a straight line a, the straight line a bisects the parallelogram ABCD into two equal parts (equal in area) and explains its application in solving problems.