![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Cho a, b, c thuộc [ 0;1]
Chứng minh răng:
1. a + b + c - abc [tex]\leq[/tex] 2
2. a + b + c + ( 1 - a) ( 1 - b) ( 1 - c) [tex]\geq[/tex] 1
Chứng minh răng:
1. a + b + c - abc [tex]\leq[/tex] 2
2. a + b + c + ( 1 - a) ( 1 - b) ( 1 - c) [tex]\geq[/tex] 1