分式题,It's easy,please help me!3个数A,B,C,其积为负,其和为正,且X=A/｜A｜+｜B｜/B+C/｜A｜+｜AB｜/AB+｜AC｜/AC+｜BC｜/BC,则AX~3+BX~2+CX+2006=?前面一道我做出了，换一道：设A，B为正整数，且2/3＜A/B＜5/7，

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分式题,It's easy,please help me!3个数A,B,C,其积为负,其和为正,且X=A/｜A｜+｜B｜/B+C/｜A｜+｜AB｜/AB+｜AC｜/AC+｜BC｜/BC,则AX~3+BX~2+CX+2006=?前面一道我做出了，换一道：设A，B为正整数，且2/3＜A/B＜5/7，
分式题,It's easy,please help me!
3个数A,B,C,其积为负,其和为正,且X=A/｜A｜+｜B｜/B+C/｜A｜+｜AB｜/AB+｜AC｜/AC+｜BC｜/BC,则AX~3+BX~2+CX+2006=?
前面一道我做出了，换一道：设A，B为正整数，且2/3＜A/B＜5/7，当B为最小值时，求A+B的值．
大哥大姐们！

分式题,It's easy,please help me!3个数A,B,C,其积为负,其和为正,且X=A/｜A｜+｜B｜/B+C/｜A｜+｜AB｜/AB+｜AC｜/AC+｜BC｜/BC,则AX~3+BX~2+CX+2006=?前面一道我做出了，换一道：设A，B为正整数，且2/3＜A/B＜5/7，
显然由题得A

A=29,B=42,A+B=71.

很简单的其实`~
把原题通分 得到 14/21＜A/B＜15/21
又因为A，B为正整数

所以可得到28/42＜A/B＜30/42

故A=29 B=42` A+B=71.
^_^

71

设A，B为正整数，且2/3＜A/B＜5/7，当B为最小值时，求A+B的值．
28/42b=42,a=29
a+b=71

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