b2c2a(a+b+c)+bc+a2c2b(a+b+c)+ac+a2b2c(a+b+c)+ab" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-table; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">
b2c2a2+ab+ac+bc+a2c2ab+b2+bc+ca+a2b2ca+bc+c2+ab" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">
b2c2(a+b)(a+c)+a2c2(b+c)(a+b)+a2b2(c+a)(c+b)" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">
b2c2(a+b)(a+c)≤bca+b+bca+c2a2c2(a+b)(b+c)≤caa+b+cab+c2a2b2(c+a)(c+b)≤abc+a+abc+b2" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">
(bca+b+caa+b)+(cab+c+abb+c)+(bcc+a+abc+a)2" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">
[c(a+b)a+b]+[a(b+c)b+c]+[b(c+a)c+a]2" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">
a+b+c2=12" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">
bca+bc+acb+ca+abc+ab≤12" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml"> ( đpcm )
13" role="presentation" style="border:0px; box-sizing:border-box; direction:ltr; display:inline-block; float:none; font-size:15.96px; line-height:0; margin:0px; max-height:none; max-width:none; min-height:0px; min-width:0px; padding:1px 0px; position:relative; white-space:nowrap; word-break:break-word; word-spacing:normal; word-wrap:normal" class="MathJax_CHTML mjx-chtml">