Download s3 ch5 proving a parallelogram 如何證明一個平行四邊形?

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s3 ch5 proving a parallelogram 如何證明一個平行四邊形? s3 ch5 proving a parallelogram 如何證明一個平行四邊形? s3 ch5 proving a parallelogram 如何證明一個平行四邊形?

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