我想問小數除法
例如：97.68除12
跟住，97比12除，個商就會得出8，跟住餘1，我本書話係呢個時候，要加小數點係個商到，我唔明點解，係因為要睇左個1，12除唔到，所以加點，定係點樣？
Thx!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
我想請問各位數學高手，請大家幫幫忙！
2008-08-03 10:02 pm
回答 (2)
2008-08-10 2:25 am
✔ 最佳答案
97.68 ÷ 12= 97.68 × 10 ÷ 12 × 10 ← 97.68和12放大10倍
= 976.8 ÷ 120 ← 放大後照除
= 8.14 ÷ 10 ← 得出答案後縮至原本的數值(÷10)
= 0.814
加小數點→小數點在商移動
★ 你放大了多少倍，答案就根據放大的數(e.g.100)的0向左移動多少位。
★★ 97.68能除12(↑上面有寫步驟)
2008-08-09 18:27:57 補充：
97.68 ÷ 12
= 97.68 × 10 ÷ 12 × 10 ← 97.68和12放大10倍
= 976.8 ÷ 120 ← 放大後照除
= 8.14
上面的不對
參考: me(絕不能抄襲), me(絕不能抄襲)
2008-08-03 11:06 pm
forget what is said in your book first. in this question,
97.68/12
=8.14
if you don't add the decimal point, the answer will become 814, which is incorrect.
so it is nessary to add the decimal point.
you need to add it between 8 and 1 because in the question, 97.68 has two decimal place and you need to have two decimal place in the answer also
you don't need to add the decimal point right after you divide 97 by 12 as stated in your book.
you can treat this question as 9768/12. you will get the answer of 814, after adding the decimal point before the 1 ( 2 decimal place), you will still obtain the correct answer 8.14
97.68/12
=8.14
if you don't add the decimal point, the answer will become 814, which is incorrect.
so it is nessary to add the decimal point.
you need to add it between 8 and 1 because in the question, 97.68 has two decimal place and you need to have two decimal place in the answer also
you don't need to add the decimal point right after you divide 97 by 12 as stated in your book.
you can treat this question as 9768/12. you will get the answer of 814, after adding the decimal point before the 1 ( 2 decimal place), you will still obtain the correct answer 8.14
收錄日期: 2021-04-19 01:36:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080803000051KK01213