有向數+-how to do

2007-09-08 10:59 pm
要有解釋E.g (+1)--(+3)=?

回答 (3)

2007-09-08 11:06 pm
✔ 最佳答案
(+1) - (+3)
=1-3
= - 2

因為(+3)前有 - 號...
由於負正得負,,所以
- (+3) = -3

2007-09-08 15:07:48 補充:
正正得正,,,負負都得正.....但係正負得負 / 負正都得負!!!
2007-09-08 11:10 pm
(+1)--(+3)

=+1-3

= -2 ( 條式可以解釋成 +1-1-1-1, +1-1 cancle, 所以餘下-1-1,i.e=-2)
2007-09-08 11:03 pm
e個=-2


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