已知一个多边形的内角和比它的外角和的3倍少180°，求这个多边形的边数．
解：设这个多边形的边数是n，
依题意得（n﹣2）×180°=3×360°﹣180°，
（n﹣2）=6﹣1，
n=7．
∴这个多边形的边数是7．
A: Excuse me. Is there a post office in the neighborhood?
B: Sorry. I'm new here. ____
A: Excuse me. Can you help me?
C: Yes? What is it?
A: ____
C: Walk along the street, and then turn right at the first crossing.
C: Yes. ____
A: Thanks a lot.
C: ____
A. It's between a hotel and the bank.
B. You're welcome.
C. You can ask others.
D. I want to know the way to the post office.
E. Is it next to a bank?
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