部分同学由于考虑问题不周全，解题时常发生漏解现象．下面几道填空题是从部分同学的《三角形》一章练习中搜集而来，每题的填空中都有遗漏且这种遗漏具有普遍性．读者看完题目后不妨先想一想：这些题错在哪里？正确答案又是什么？例１若一个三角形的三条高中有两条不在三角形? Some classmates are not thorough in considering the problem, and the problem-solving often occurs. The following blank-filling questions were collected from the practice of some of the students’ “Triangle” chapters. The fill-in of each question has been omitted and this omission is universal. After reading the topic, readers may wish to think first: Where are these problems wrong? What is the correct answer? Example 1 If two triangles in a triangle are not in triangles?