find the value of the expression
1 - 2 + 3 - 4 + ..... +99 -100
HELP!! Plz give me the working and answer
F.1 Maths
2007-09-24 3:19 am
回答 (4)
2007-09-24 3:25 am
✔ 最佳答案
1 - 2 + 3 - 4 + ..... +99 -100= (1 – 2) + (3 – 4) + (5 – 6) + … + (99 – 100)
= (-1) + (-1) + (-1) + … (-1) [a total of 50 items]
= -50
2007-09-24 3:34 am
(-1)x50
=-50
=-50
2007-09-24 3:25 am
(1-2)+(3-4)+......+(99-100)
=-1x50
=-50
=-1x50
=-50
2007-09-24 3:23 am
-1x(100/20)
=-50
=-50
收錄日期: 2021-04-30 21:01:59
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