tính A= 1/2-2/3+3/4-4/5+5/6-6/7-5/6+4/5-3/4+2/3-1/2

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1. `A=1/2-2/3+3/4-4/5+5/6-6/7-5/6+4/5-3/4+2/3-1/2`

   `A=(1/2-1/2)+(-2/3+2/3)+(3/4-3/4)+(-4/5+4/5)+(5/6-5/6)-6/7`

   `A=0+0+0+0+0-6/7`

   `A={-6}/7`

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2. `A“=“1/2“-“2/3“+“3/4“-“4/5“+“5/6“-“6/7“-“5/6“+“4/5“-“3/4“+“2/3“-“1/2“

   `=“(“1/2“-“2/3“+“2/3“-“1/2“)“+“(“3/4“-“4/5“+“4/5“-“3/4“)“+“(“5/6“-“5/6“)“-“6/7`

   `=“0“+“0“+“0“-“6/7`

   `=“-“6/7`

   Chúc bạn học tốt!!!

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