這個符號點解!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

🎓 學業台小學及中學教育

pang

2007-08-24 4:29 am

±這個符號點解

回答 (5)

Auntie Stella

2007-08-24 4:37 am

✔ 最佳答案

正數和負數
例如：4的平方根可以是2 或-2，答案便可寫成 ±2
(2x2=4；-2x-2=4)

👍 0 👎 0

R Ho

2007-08-24 9:44 am

It represents a RANGE of values based on a given number. Eg., 100 +/- 10 gives a range of values from (100-10) to (100+10), i.e., 90 to 110. You use this symbol whenever you want to specify a range of values with same difference in each direction of a based number.

👍 0 👎 0