Question

gia tri nho nhat cua bieu thuc A=x^4+2015*x^2+3*10^2

co loi gia 

Answer 1

Ta co : x^4 > 0 ; x^2 > 0 => 2015*x^2 > 0

    <=> x^4 + 2015*x^2 + 3*10^2 > 300

Đau "=" xảy ra <=> x^4=0;x^2=0 <=> x=0

Vậy Min A = 300 <=> x = 0