急*數學白痴一問! 中2數學`

2007-09-26 11:11 pm

0.5
------- x 100% = 20%
x

x 是..?

請盡量答詳細一點!不要
太簡略步驟* -3- 唔該哂.

回答 (3)

2007-09-26 11:24 pm

✔ 最佳答案

( 0.5 / x ) x 100% = 20%
0.5 / x = 20% / 100%
0.5 / x = 0.2 / 1
0.5 / x = 0.2
0.5 = 0.2 x
0.5 / 0.2 = x
x = 2.5

盡量詳細的了，希望幫到你吧！

參考: 自己計~~

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2007-09-27 1:02 am

100%=100/100=1 20%=20/100=0.2

0.5/x=0.2/1
0.5=0.2x
x=2.5

參考: myself

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2007-09-26 11:20 pm

(0.5/x)=20%/100%
0.5/x=0.2
0.5=0.2x
0.5/0.2=x
x=2.5

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