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Junior high school junior high school mathematics examination paper
1.MC = 6, CN = 4, then MN = 6+4 = 10.

The length of 2.2. MN is equal to half the length of a.

3. If the point C is on the AB line, then the point C is in AB, and the length of MN is half that of AC+BC.

Point c is on the straight line AB, and it is possible that point c is outside AB. The length of MN at this time is half of the absolute value of (AC-BC).

Hehe, I hope I can score.

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