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如图1,MA 1 ∥ NA 2 ,则∠A 1 +∠A 2 =______度. 如图2,MA 1 ∥ NA 3 ,则∠A 1 +∠A 2 +∠A 3 =______度. 如图3,MA 1 ∥ NA 4 ,则∠A 1 +∠A 2 +∠A 3 +∠A 4 =______度. 如图4,MA 1 ∥ NA 5 ,则∠A 1 +∠A 2 +∠A 3 +∠A 4 +∠A 5 =______度.从上述结论中你发现了什么规律? 如图5,MA 1 ∥ NA n ,则∠A 1 +∠A 2 +∠A 3 +…+∠A n =______度.