P
pttruyen_1997
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
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1)Cho tam giac ABC co Goc A=90
cm 3AB+ 4AC[TEX]\leq[/TEX]5BC
2) Cho goc xAy=90 do, B thuoc Ax; c thuoc Ay
cm: AB+ [TEX]\sqrt{3}[/TEX]AC [TEX]\leq[/TEX]2BC
![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
cm 3AB+ 4AC[TEX]\leq[/TEX]5BC
2) Cho goc xAy=90 do, B thuoc Ax; c thuoc Ay
cm: AB+ [TEX]\sqrt{3}[/TEX]AC [TEX]\leq[/TEX]2BC