數學--有點像關於指數律

2008-08-23 5:13 am
算考卷時算到這題
已知2+2/3=22*2/3,3+3/8=32*3/8,4+4/15=42*4/15.....
若10+a/b=102*a/b,20+m/n=202*m/n
則a/b*n/m=?
答案為133/66,求解答過程!!
更新1:

比較小的〝2〞是指平方

回答 (1)

2008-08-23 5:38 am
✔ 最佳答案
10 + a/b = 10² * a/b

(10b+a)/ b = 100a/b

10b +a = 100a

10b = 99a

b = 99a/10

20 + m/n = 20² * m/n

(20n+m)/n = 400m/n

20n + m = 400m

20n = 399m

n = 399m/20

a/b * n/m

= a/(99a/10) * (399m/20)/m

= 10/99 * 399/20

= 133/66

http://tw.myblog.yahoo.com/jw!JCVbjQyaBRbXTWOakincl1.Wpxbobg--/article?mid=4908
參考: 思瑜的部落格


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