以能力立意是高考数学命题的指导思想,在知识交汇点设计试题是高考命题的新特点和大方向.与数学期望交汇的综合问题正是在这种背景下“闪亮登场”,频频出现在各级各类考试题中.由于这类题目涵盖的知识点多且交汇性强,数学思想和方法考查充分,考生普遍感到难以下手,考试时经常弃 It is the guiding ideology of mathematics propositions for college entrance examinations. It is the new feature and general direction of the college entrance examination proposition that the questions are designed at the intersection of knowledge. The comprehensive problem that meets the mathematical expectation is precisely the “sparkling debut” in this context and frequently occurs. Various types of examination questions at various levels. As the topics covered by this type of topics are many and highly interactive, mathematical thinking and methods are fully examined. Candidates generally feel that it is difficult to start, often abandoned during examinations.