xȡʲôֵʱʽֵСڵֵдʱxСֵ-꼶ѧ
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⣺֪![]() ![]() ãx2 ൱2ʱ ![]() ![]() |
רȨ⡰xȡʲôֵʱʽֵСڵֵдʱxСֵ-..Ҫ һԪһβʽĽⷨ ȿ⡣Щġ£
һԪһβʽĽⷨ
ƣһԪһβʽĽⷨ
һԪһβʽĽ⼯
һδ֪IJʽн⣬ʽĽ⼯s
ʽx-5-1Ľ⼯Ϊx4
ʽx0Ľ⼯ʵ
ʽ⼯Ĺ̽ⲻʽ
ʽΪax>bʽ
(1)a>0⼯Ϊx>b/a
(2)a<0⼯Ϊx<b/aһԪһβʽ⣺
ʽĽ⼯һһȡֵΧʱҪδ֪ijЩ⣬⡢⡢ȣؼȷ- ʽĽ⼯
ʽδֵ֪ʽĽ⡣x=1x+2>1Ľ
ٲʽĽָijһΧڵij治ʽеδ֪ʽ
Ҫжijδֵ֪DzDzʽĽ⣬ֱӽֵʽߣʽǷǣǡ
һأһʽĽⲻֹһд3x>3Ľ⣬Ҳ|x|Q0ֻһ⣬Ϊx=0
ʽĽ⼯ͲʽĽͬĸ
ٲʽĽ⼯һһȡֵΧΧڵÿһֵDzʽһ⣬ʽһ⡣
ڲʽĽ⼯˼
⼯еκһֵʹʽ⼯κһֵʹʽʽ
۲ʽĽ⼯ֱ۵ıʾ粻ʽx-1<2Ľ⼯x<3,ϱʾ3ĵ߲ʾϱʾ3ĵλϻԲȦʾһ㡣 һԪһβʽĽⷨ
һԪһβʽһԪһη̵ķƣֻòʽ3ԲʽбʱҪı䲻ʽķš
ֽ˼·
1òʽĻʣ跨δ֪ڲʽһߣһߣ
2ýһԪһη̵Ľⲽ裺ȥĸȥšϲͬϵΪ1Ȳ衣
һԪһβʽһ˳
1ȥĸ òʽ23
2ȥ
3 òʽ1
4ϲͬ
5δ֪ϵΪ1 òʽ23
6ЩʱҪϱʾʽĽ⼯
ʽ⼯ıʾ
1 òʽʾһģһδ֪IJʽ⣬⼯һΧΧIJʽ
磺x-12Ľ⼯x3
2 ʾʽĽ⼯ֱ۵رʾ˵ʽ⡣
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