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如图，方格纸中的每个小正方形的边长均为1．（1）观察图①，②中所画的“L”型图形，然后各补画一个小正方形，使图①中所成的图形是轴对称图形，图②中所成的图形是中心对称图形；（2）补画后，图①，②中的图...
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