1.姊姊和我共有720元,我比姊姊少40%,我有多少元?
2.1乘(16-K)+2K=30
NO.2 要部驟
數學題....解方程
2007-05-26 6:29 pm
回答 (7)
2007-05-26 6:36 pm
✔ 最佳答案
1) 設你有A元A+(1-40%)A=720
A+0.6A=720
1.6A=720
A=450
所以你有450元~
2) 1 X (16-K)+2K=30
16-K+2K=30
K=14
參考: me
2007-05-30 4:48 am
1.設姊姊有y元, 我比姊姊少40%, 所以我有(1-40%)y元.
姊姊和我共有720元, 所以,
y + (1-40%)y = 720
y + 0.6y = 720
1.6y = 720
y = 450
因此, 姊姊有450元, 而我則有 720 - 450 = 270(元)
2. 1x(16-K)+2K=30
16 - K + 2K = 30
16 + K = 30
K = 30 - 16
K = 14
姊姊和我共有720元, 所以,
y + (1-40%)y = 720
y + 0.6y = 720
1.6y = 720
y = 450
因此, 姊姊有450元, 而我則有 720 - 450 = 270(元)
2. 1x(16-K)+2K=30
16 - K + 2K = 30
16 + K = 30
K = 30 - 16
K = 14
參考: me
2007-05-26 8:13 pm
設你有p元
p+(1-40)p=720
p+0.6p=720
1.6p=720
p=450
So你有450元~p
1 X (16-K)+2K=30
16-K+2K=30
K=14
p+(1-40)p=720
p+0.6p=720
1.6p=720
p=450
So你有450元~p
1 X (16-K)+2K=30
16-K+2K=30
K=14
2007-05-26 7:36 pm
1.)設我有$x.
x+(60%)x=720
x+0.6x=720
1.6x=720
x=450
2.)
1x(16-k)+2k=30
16-k+2k=30
16+k=30
k=14
x+(60%)x=720
x+0.6x=720
1.6x=720
x=450
2.)
1x(16-k)+2k=30
16-k+2k=30
16+k=30
k=14
參考: 自己的Math 頭腦!?
2007-05-26 6:42 pm
1.設姊姊有x元, 我比姊姊少40%, 所以我有(1-40%)x元.
姊姊和我共有720元, 所以,
x + (1-40%)x = 720
x + 0.6x = 720
1.6x = 720
x = 450
因此, 姊姊有450元, 而我則有 720 - 450 = 270(元)
2. 1乘(16-K)+2K=30
(16 - K) + 2K = 30
16 - K + 2K = 30
16 + K = 30
K = 30 - 16
K = 14
姊姊和我共有720元, 所以,
x + (1-40%)x = 720
x + 0.6x = 720
1.6x = 720
x = 450
因此, 姊姊有450元, 而我則有 720 - 450 = 270(元)
2. 1乘(16-K)+2K=30
(16 - K) + 2K = 30
16 - K + 2K = 30
16 + K = 30
K = 30 - 16
K = 14
2007-05-26 6:40 pm
l1.姊姊和我共有720元,我比姊姊少40%,我有多少元?
et x be the money I have, and y be the money my sister have
x+y=720------------------------1
x(1+0.4)=y----------------------2
sub 2 into 1
1.4x+x=720
2.4x=720
x=300
sub x=300 into 1
300+y=720
y=420
ThereforeI have $300, my sister have $420
--------------------------------------------------------------------------------------------------------------------------------
2.1乘(16-K)+2K=30
1*(16-K)+2K=30
16-K+2K=30
-K+2K=14
K=14
et x be the money I have, and y be the money my sister have
x+y=720------------------------1
x(1+0.4)=y----------------------2
sub 2 into 1
1.4x+x=720
2.4x=720
x=300
sub x=300 into 1
300+y=720
y=420
ThereforeI have $300, my sister have $420
--------------------------------------------------------------------------------------------------------------------------------
2.1乘(16-K)+2K=30
1*(16-K)+2K=30
16-K+2K=30
-K+2K=14
K=14
參考: By my calculation
2007-05-26 6:37 pm
1) 我有270
2) 1 x (16-K) + 2K = 30
=> 16 - K + 2K = 30
=> K = 30 - 16
=> K = 14
2) 1 x (16-K) + 2K = 30
=> 16 - K + 2K = 30
=> K = 30 - 16
=> K = 14
收錄日期: 2021-04-12 19:51:14
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