1. (+26)-(-15)
2. (-12)+(-19)
3. (-28)-(+13)
4. (-27)+(+34)
5. (-12)+(+27)-(+20)
請解释答案......................................
THX
Maths(20)
2008-08-30 1:52 am
回答 (2)
2008-08-30 1:59 am
✔ 最佳答案
1. (+26)-(-15)= 26+15
= 41
2. (-12)+(-19)
=-12-19
=-31
3. (-28)-(+13)
= -28-13
=-41
4. (-27)+(+34)
=-27+34
=7
5.(-12)+(+27)-(+20)
=-12+27-20
=5
記住: 負負得正，正正得正，負正得負 !!!!!!!!!
2008-08-31 6:57 am
cheng_cwpeter回答唔錯,,,
但係最後一題 : 5. (-12)+(+27)-(+20)
唔係正5呀,,,,,,係負5呀,,,佢計錯
但係最後一題 : 5. (-12)+(+27)-(+20)
唔係正5呀,,,,,,係負5呀,,,佢計錯
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