导读：40篇短文搞定高考3500个单词 第 2 页 共 21 页 2 3. A Hard Trip 一次辛苦的旅行 My sister was fond of traveling. Ever since graduating, she had been determined to organize a trip to an old temple. Since transporting fare was expensive, she decided to use a bicycle to cycle...

解设角1为X度
X+4X=180-90
5X =90
X =18
18X4=72度、
算术
（180-90）/（4+1）=18
18X4=72