วิธีที่สอง เป็นวิธีที่รวดเร็วครับแต่ต้องจำรูปแบบประพจน์ีที่สมมูลกัน รูปแบบที่ 1. p→q สมมูลกับ ~p V q ดังนั้น ~p→( q→( r V p ) จะสมมูลกับ ~(~p)V ( q→( r V p )) และ ~(~p) V ( q→( r V p )) สมมูลกับ p V ( q→( r V p ))--------(1) ต่อมาพิจารณาตรงส่วน ( q→( r V p )) ได้่ว่าจากรูปแบบที่ 1 q→( r V p ) จะสมมูลกับ ~q V( r V p ) ดังนั้นจาก (1) ที่ติดไว้จะได้ว่า p V ( q→( r V p )) สมมูลกับ p V (~q) V ( r V p ) รูปแบบที่ 2. p V p สมมูลกับ p ดังนั้นจาก p V ~q V ( r V p ) จะสมมูลกับ p V ~q V r V p (เนื่องจากเชื่อมด้วย V ทั้งหมด จึงสามารถที่จะดึงวงเล็บออกได้) และจะสมมูลกับ p V p V (~q) V r และจะสมมูลกับ p V (~q) V r ซึ่งได้ตรงตามช้อยส์ข้อที่ 2 ครับ
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The actions come as Obama is facing resistance from Republicans to a 7 billion jobs package he has urged Congress to pass.
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One of the best places to find The North Face sale is on the Internet. Unbelievably you can hunt down this season’s jackets for up to 60% off the original price! It’s hard to turn down a deal like that, especially when you are used to paying full price for them. While Internet shopping is convenient for many, it also turns many people off because you must also pay for shipping to actually receive the products that you buy online.
WASHINGTON (Reuters) - President Barack Obama this week will announce a series of actions to help the economy that will not require congressional approval, including an initiative to make it easier for homeowners to refinance their mortgages, according to a White House official.
The actions come as Obama is facing resistance from Republicans to a 7 billion jobs package he has urged Congress to pass.
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