图1-26是由23根火柴摆成的含有12个小三角形的梯形,请问最少移动几根火柴,就可以让梯形倒转过来呢?
图1-26 srp5osYYA5/ZLskfRn8BhUWd8UciFOqTa/ts8I5VXHr0n3pi5eSwuzgh+5rsuspb