(-2.5) - (-5.2) - (+1.7) =
(+1.3)+ (+2.7)+ (-1.4) =
(-23)+ (+39)-(-17)=
向數20分
2007-09-06 12:05 am
回答 (2)
2007-09-06 12:25 am
✔ 最佳答案
其實lee類數首先唔好急, 慢慢拆括號正正得正, 正負得負, 負負得正
再做加減
(-2.5) - (-5.2) - (+1.7)
= -2.5 + 5.2 - 1.7
= 2.7-1.7
=1
(+1.3)+ (+2.7)+ (-1.4)
= 1.3 + 2.7 -1.4
= 4 - 1.4
= 2.6
(-23)+ (+39)-(-17)
= -23 + 39 + 17
= 16 + 17
=33
2007-09-06 12:09 am
(-2.5) - (-5.2) - (+1.7) = 1
(+1.3)+ (+2.7)+ (-1.4) = 2.6
(-23)+ (+39)-(-17)= 33
(+1.3)+ (+2.7)+ (-1.4) = 2.6
(-23)+ (+39)-(-17)= 33
參考: 我自己
收錄日期: 2021-04-13 13:19:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070905000051KK01804