【正文】 腦??灑啥??敠??＊??????昊：?勻歟????＊函數(shù)f(x)=kx+h在x∈R??鸚?灑?＊m＜x＜n?替?碭??替?洀?????當k＜0時??灑晥?碭??欀碭?梔?磽?刢?上是減函數(shù)?淿?磿?滿?＊f(x)＞f(n)＞0??所以對于任意x∈(m?滿???晧?碭??????＊?????慜戀?戀挀?挀愀??餀??戀?挀?愀?戀挀???＊構造函數(shù)f(x)=(b+c)x+bc+1???f(a)=(b+c)a+bc+1??當b+c=0時?珿打??挀?＊ f(a)=bc+1=c2+1??因為|c|＜1??晎?愀???挀??????＊?勻扟?挀懷〢??＊f(x)=(b+c)x+bc+1為x的一次函數(shù)??因為|b|＜1?糿挀簀???＊?昀????戀?挀?戀挀??????戀????挀????＊ f(1)=bc+bc+1=(1b)(1c)＞0??由問題(1)對于|a|＜1的一芻值f(a)＞0?珿???＿?縂蚪?筣?????胹袧???酪????????歕滸?敝?窖??砞?????⑻??膈??騰?瓰?????????瑲?擂?硞????錸??竡???????咟?嚕蹮貝?????寶??偨??堠?炨酌??錍彰??冏?????涏ｄ澤澕蠛?彝???﹣???????姁u?????壣忈??ベ體?????モ?鋂?逆怾?葊??砊頤匩ど泑??玊??懣????????呎妄?扲卨?????????閄?黱??蒃??????嘊??婒???島淽???喡?鏹徲篋箬婰??饳?鷡塒鋖遢剎??貄?羏?捲菝??蒔?嶟?兾?岞嚪昪??刊?灤?餆?????????????屠?謆???凖?悞?炐?????甑??唊?噰婘?