maths

2007-05-18 4:37 am

N 除 20%=12-N
give me the step and answer

回答 (5)

2007-05-18 4:42 am

✔ 最佳答案

N 除 20%=12-N
N 除0.2=12-N
N=2.4-0.2N
1.2N=2.4
N=2

參考: me

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2007-05-18 5:22 am

N 除 20%=12-N:

n
___ =12-n
20%

n=20%(12-n)

n=2.4-n20%

n=2

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2007-05-18 4:57 am

20%=20/100=0.2
n
----- =12-n
0.2
n=2.4-0.2n
1.2n=2.4
n=2

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2007-05-18 4:52 am

20%=20/100=0.2

n
----- =12-n
0.2

n=2.4-0.2n

1.2n=2.4

n=2

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2007-05-18 4:44 am

N 除 20%=12-N
N / 0.2 = 12-N
N = 2.4 - 0.2N
N + 0.2N = 2.4
1.2N = 2.4
N = 2

參考: myself

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