請指教這數學題
回答 (3)
2009-11-14 10:55 pm
✔ 最佳答案
設小數是 x,則大數是 x + 15 (因為兩數相差15)
(x + 15)/4 - 2x = 5
x + 15 - 8x = 20
-7x = 5
x = -5/7
所以,
大數 = -5/7 + 15
= 100/7
2009-11-14 10:54 pm
吾係好明..
又話差係15
又話係5
if the difference is 15:
Let x be the larger value
x/4 - 2(1-x/a) = 15
x/4 - (2 - 2x/4) =15
x/4 - 2 + 2x/4 =15
3x/4 - 2 =15
3x/4 = 17
3x =68
x =22 右 2/3
又話差係15
又話係5
if the difference is 15:
Let x be the larger value
x/4 - 2(1-x/a) = 15
x/4 - (2 - 2x/4) =15
x/4 - 2 + 2x/4 =15
3x/4 - 2 =15
3x/4 = 17
3x =68
x =22 右 2/3
參考: Me^^
2009-11-14 10:31 pm
大數=100/7
小數=-5/7
小數=-5/7
收錄日期: 2021-04-23 20:39:53
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