請問5/6, 7/9, 9/13 那個數大D?及點計?????????????
2007-03-16 18:36:10 · 8 個解答 · 發問者 kwok wai 1 in 教育與參考 ➔ 小學及中學教育
5/6 x 117/117 = 585/702
7/9 x 78/78 = 546/702
9/13 x 54/54 = 486/702
5/6最大, 9/13最小
2007-03-17 08:56:20 · answer #1 · answered by 123 6 · 0⤊ 0⤋
答案係:5/6
因為要搵L.C.M(最少公倍數)即係要1X6X9X13
2007-03-16 19:38:24 · answer #2 · answered by ? 2 · 0⤊ 0⤋
1. 數值: 5/6 最大 > 7/9 稍細 > 9/13 最細
2. 計算: 通份母。
(1) 把各分母乘起來,成為一個共用的分母: 6X9X13=702
因為13是個質數,無法跟其他分母一起分解,所以全部乘起來。
(2) 把各分子也同時增大,分母倍增多少,分子也倍增多少:
5----------------5X9X13------------585
________________________________
6X9X13----------702---------------702
7----------------7X6X13-------------546
_________________________________
9X6X13----------702---------------702
9-----------------9X6X9--------------486
__________________________________
13X6X9----------702----------------702
由於通了分母,分母相等,分子便可以作出數值上的比較。
2007-03-16 19:20:58 · answer #3 · answered by eppie7788 7 · 0⤊ 0⤋
5/6
6x9x13=702
702除以6=117,117x5=585(5/6=585/702)
702除以9=78,78x7=546(7/9=546/702)
702除以13=54,54x9=486(9/13=486/702)
約簡,是5/6大D
2007-03-16 18:55:15 · answer #4 · answered by twinsada2004 1 · 0⤊ 0⤋
according to my calculator
5/6 = 0.83333333...........
7/9 = 0.77777777...........
9/13 = 0.692307692..........
from the results above, you can see 5/6 is bigger than other two.
another method is calculating the LCM (最小公倍數) of 6, 9 and 13, that will be 702.
5/6 = 585/702
7/9 = 546/702
9/13 = 486/702
so 5/6 is bigger, any questions?
2007-03-16 18:47:10 · answer #5 · answered by 曄 1 · 0⤊ 0⤋
5/6, 7/9, 9/13
通分母之後=585/702, 546/702, 486/702
所以,應該係5/6大d
2007-03-16 18:47:05 · answer #6 · answered by 幸福女孩 2 · 0⤊ 0⤋
5/6 x 117/117 = 585/702
7/9 x 78/78 = 546/702
9/13 x 54/54 = 486/702
5/6最大, 9/13最小
2007-03-16 18:46:38 · answer #7 · answered by Michael 2 · 0⤊ 0⤋
5/6那個數大D
2007-03-16 18:41:47 · answer #8 · answered by 惠欣 1 · 0⤊ 0⤋