這是小五的功課:
有一瓶水, 數日后蒸發了2 1/2升,加進1 2/3升, 數日后又蒸發了1 1/2 升,現在水的總容量比原來的少了幾升?
要列出整題算式.
Thanks.
小學數學 分數加減
2007-10-06 6:34 am
回答 (11)
2007-10-06 7:09 am
1-2 1/2+1 2/3-1 1/2
=1-2 3/6+1 4/6-1 3/6
= -1 3/6+1 4/6-1 3/6
=1/6-1 3/6
= -1 2/6
= -1 1/3
首先將2.3.2 . 找出最小公倍數。
跟住就好簡單啦!!! 我 都係讀小五呀.... 我都好似做過...
係邊本功課有^_^
=1-2 3/6+1 4/6-1 3/6
= -1 3/6+1 4/6-1 3/6
=1/6-1 3/6
= -1 2/6
= -1 1/3
首先將2.3.2 . 找出最小公倍數。
跟住就好簡單啦!!! 我 都係讀小五呀.... 我都好似做過...
係邊本功課有^_^
2007-10-06 6:52 am
2 1/2 - 1 2/3 + 1 1/2
= 2 3/6 - 1 4/6 + 1 3/6(通分母)
=15/6-10/6+9/6
=14/6
=7/3(約簡)
=2 1/3 (升)
= 2 3/6 - 1 4/6 + 1 3/6(通分母)
=15/6-10/6+9/6
=14/6
=7/3(約簡)
=2 1/3 (升)
2007-10-06 6:47 am
現在水的總容量比原來的少:
1-2 1/2+1 2/3-1 1/2
=1-2 3/6+1 4/6-1 3/6
= -1 3/6+1 4/6-1 3/6
=1/6-1 3/6
= -1 2/6
= -1 1/3,,
1-2 1/2+1 2/3-1 1/2
=1-2 3/6+1 4/6-1 3/6
= -1 3/6+1 4/6-1 3/6
=1/6-1 3/6
= -1 2/6
= -1 1/3,,
2007-10-06 6:45 am
1 - 2 1/2 + 1 2/3 - 1 1/2
2007-10-06 6:42 am
X-(X-2 1/2L+1 2/3L-1 1/2L)
=X-(X-3L+1 2/3L)
=X-(X-2 1/3L)
=X-(X-3L+1 2/3L)
=X-(X-2 1/3L)
2007-10-06 6:41 am
(2 1/2+1 2/3-1 1/2)- 2 1/2
=1/6
我諗應該係多左,唔係少左...
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希望幫到你la~^^
=1/6
我諗應該係多左,唔係少左...
---------------------------------------
希望幫到你la~^^
2007-10-06 6:40 am
Let X be the original volume of water.
X-(X-2 1/2L+1 2/3L-1 1/2L)
=X-(X-3L+1 2/3L)
=X-(X-2 1/3L)
X-(X-2 1/2L+1 2/3L-1 1/2L)
=X-(X-3L+1 2/3L)
=X-(X-2 1/3L)
參考: by me
2007-10-06 6:37 am
一瓶水有幾多升先?
2007-10-05 22:43:29 補充：
如果唔知就係題代數問題"個答案就係:y-2 1/2 1 2/3-1 1/2因為唔知一瓶水有幾多升...所以係唔知少左幾多升...
2007-10-05 22:43:29 補充：
如果唔知就係題代數問題"個答案就係:y-2 1/2 1 2/3-1 1/2因為唔知一瓶水有幾多升...所以係唔知少左幾多升...
參考: By.CooL
2007-10-06 6:37 am
-2 1/2 + 1 2/3 - 1 1/2
2007-10-06 6:36 am
1-(2 1/2)+(1 2/3)-(1 1/2)
收錄日期: 2021-04-13 15:50:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071005000051KK04151