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人教版数学必修1“1.1.2集合间的基本关系”仅配一个例题:写出集合{a,b}的所有子集,并指出哪些是它的真子集.解:集合{a,b}的所有子集为φ,{a},{b},{a,b}.其中真子集为φ,{a},{b}.这里题目和解答都非常简洁,一般学生也都能看得懂,例题后的练习题第1题是:写出集合{a,b,c}的所有子集.让学生依葫芦画瓢,结果却让老师大失所望:一个班(普通学校普通班)中竟有近半学生写出{a},{b},{c}后就不写了;还有些学生把集合写成元素形式
PEP 1 Mathematica 1 “1.1.2 The basic relationship between sets ” With only one example: write out all the subsets of the set {a, b}, and indicate which ones are its true subsets. Solution: The set {a , all subsets of b} are φ, {a}, {b}, {a, b}, where the true subset is φ, {a}, {b}. The questions and answers here are very concise, Can understand, the first question after the example of the first question is: write out all the subset {a, b, c} so that students draw gourd, the result disappointed the teacher: a class (ordinary school ordinary class ) Almost half of students wrote {a}, {b}, {c} did not write; others write the collection as an element