D = 1 – 2 – 3 + 4 + 5 – 6 – 7 +…+ 97 – 98 + 99 + 100

2 bình luận về “D = 1 – 2 – 3 + 4 + 5 – 6 – 7 +…+ 97 – 98 + 99 + 100”

1. D = 1 – 2 – 3 + 4 + 5 – 6 – 7 +…+ 97 – 98 – 99 + 100

   D = (1 – 2 – 3 + 4) + (5 – 6 – 7+8)+…+ (97 – 98 – 99 + 100)

   D = 0 + 0 + 0 + …. +0

   D = 0 . 25

   D = 0

   @na

   Trả lời
2. S=1-2-3+4+5-6-7+…+97-98-99+100

     =(1-2-3)+4+(5-6-7)+8…+(97-98-99)+100

     =(-4)+4+(-8)+8+…+(-100)+100

     =[(-4)+4]+[(-8)+8]+…+[(-100)+100]

     =0+0+…+0

     =0

   Trả lời