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badl91@yahoo.com.vn
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1. Tìm x sao cho 13 căn (x^2 - X^4) + 9 căn (x^2+X^4) = 16
2 So sánh P = 3/(1!+2!+3!)+4/(2!+3!+4!)+...+2014/(2012!+2013!+2014!) với 1/2
3. Tìm x min sao cho A = x^2 + căn [x^4+1/(x^2)]
2 So sánh P = 3/(1!+2!+3!)+4/(2!+3!+4!)+...+2014/(2012!+2013!+2014!) với 1/2
3. Tìm x min sao cho A = x^2 + căn [x^4+1/(x^2)]