Edexcel IGCSE Maths复习笔记 1.6.1 Set Notation & Venn Diagrams

Edexcel IGCSE Maths复习笔记 1.6.1 Set Notation & Venn Diagrams

What do I need to know?

• You’ll be drawing Venn diagrams so make sure you are familiar with those first
• Notation

ξ is the universal set (the set of everything)

a ∈ B means a is an element of B (a is in the set B)

A ∩ B means the intersection of A and B (the overlap of A and B)

A ∪ B means the union of A and B (everything in A or B or both)

A' is “not A” (everything outside A)

Sets can be written as a list of elements (members) or described in words – either way curly brackets are used:

• • A={3, 6, 9, 12, 15, 18}
  • A={Multiples of 3 less than 20}

Worked Example

Worked Example

转载自savemyexam