請問這條數點計?

2006-12-30 2:03 am
7.27-9.3+6.23-8.26+6.26-7.16-8.27+5.15 (用集中數字法)

回答 (4)

2006-12-30 2:17 am
✔ 最佳答案
7.27-9.3+6.23-8.26+6.26-7.16-8.27+5.15
=(-2.03+6.23)-8.26+6.26-7.16-8.27+5.15
=(4.2-8.26)+6.26-7.16-8.27+5.15
=(-4.06+6.26)-7.16-8.27+5.15
=(2.2-7.16)-8.27+5.15
=(-4.96-8.27)+5.15
=-13.23+5.15
=-8.08(答案).
參考: Me.
2006-12-30 8:22 am
無得計~~~~~~~~~~~
2006-12-30 2:22 am
7.27-9.3+6.23-8.26+6.26-7.16-8.27+5.15
=( 7-9+6-8+6-7-8+5 )+( 0.27-0.3 + 0.23-0.26 + 0.26-0.16-0.27+ 0.15 )
{這裡用了整數和小數分算法}
= -2+( 0.27-0.3 + 0.23-0.27-0.16+ 0.15 -0.26 + 0.26)
= -2+( 0.24-0.04-0.01 )
= -2.19
2006-12-30 2:07 am
-8.08


收錄日期: 2021-04-12 23:53:53
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