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mylucky.yourlucky
2 năm trước
1,chứng minh rằng : x(3+y+1)^2+1 >=3y 2, với x,y là các số thực dương, CMR: 1/a+3b +1/b+3c+1/c+3a>=1/2a+b+c+1/a+2b+c+1/a+b+2c (a,b,c >0)
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