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A – B = A – (A ∩ B)
1) แสดง     A-B




2. แสดง A – (A∩B)




จากแผนภาพ 1) และ 2) ข้างบน
เราจะเห็นว่าบริเวณที่แรเงาของ A- B และ A – (A ∩ B) คือ
บริเวณเดียวกัน
ดังนั้น เราก็สรุปได้ว่า         A – B = A – (A ∩ B)

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A b

  • 1. A – B = A – (A ∩ B) 1) แสดง A-B 2. แสดง A – (A∩B) จากแผนภาพ 1) และ 2) ข้างบน เราจะเห็นว่าบริเวณที่แรเงาของ A- B และ A – (A ∩ B) คือ บริเวณเดียวกัน ดังนั้น เราก็สรุปได้ว่า A – B = A – (A ∩ B)