數學問題.............................................

2007-05-24 1:33 am
1. 5分之3( L - 4 ) = 4

方程:_____________________

驗算:________________________


2. 6 分之 5 t - 2有分2之1 = 4分之3

方程:_______________________

驗算:____________________________

回答 (2)

2007-05-24 1:59 am
✔ 最佳答案
1. 5分之3( L - 4 ) = 4

方程:2( L - 4 ) = 4 (1.5分之3=2)
L - 4 = 2 (將2搬過)
L = 6 (將-4搬過)
驗算: 2 ( 6 - 4 ) =4 (代入答案)
2 X 2 = 4

2007-05-23 18:00:29 補充:
1. 3/5 不等於1. 5分之3

2007-05-23 18:01:38 補充:
mak_ronald的答案是錯的。(一開始已經錯了!)

2007-05-23 18:35:35 補充:
對不起,看錯了!mak_ronald的答案的確是錯的。

2007-05-23 18:36:41 補充:
(第一條)方程:5分之3( L - 4 ) = 4 3/5( L - 4 ) = 4 L - 4 = 4 X ( 5 / 3 ) ─ ( 3/5搬過去 = 分子分母上下倒轉 )

2007-05-23 18:36:55 補充:
L - 4 = 20/3 L = (20/3) 4 ─ ( -4搬過去 = 4 ) L = 32/3 ─ ( 4搬過去 = 12/3 )

2007-05-23 18:37:30 補充:
(第二條)方程:2. 6 分之 5 t - 2有分2之1 = 4分之3 (5/(13/5))t - 5/2 = 3/4 ─ ( 2.6分 = 13/5 =2有分5之3 ) (25/13)t - 5/2 =3/4 ─ ( 除號轉 乘號 :分子分母上下倒轉) ─ 5X(5/13)

2007-05-23 18:37:45 補充:
(25/13)t =(3/4) (10/4) ─ ( 分子分母通分 )、(搬過= 變 -) (25/13)t = 13/4 ─ ( 分母相通,才可相加 ) t = (13/4) X (13/25) ─ ( 移項 :移乘作除;移除作乘) 驗算:(代入答案)

2007-05-23 18:42:28 補充:
注意(L-4)=4X5/3L不=(20/3)-4L=(20/3) 4
2007-05-24 1:42 am
1. 3/5(L-4)=4
3(L-4)=4X5
(L-4)=4X5/3
L=20/3-4
L=6 2/3-4
L=2 2/3

2. (5t-2)/6 X 1/2=3/4
(5t-2)/12=3/4
(5t-2)=3X12/4
5t-2=9
5t=9+2
t=11/5

QED


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