Cho a,b,c không âm, CMR $(a+b+c)^2+2abc+4 \geq 3(ab+bc+ca)+2(a+b+c)$
$(a+b+c)^2+2abc+4 \geq 3(ab+bc+ca)+2(a+b+c)$
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jupiterhn9x
, 02-01-2022 - 10:50
#2
Posted 02-01-2022 - 17:20
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Cho a,b,c không âm, CMR $(a+b+c)^2+2abc+4 \geq 3(ab+bc+ca)+2(a+b+c)$
https://artofproblem...677338p23334207
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