A.\({\left( {a - \dfrac{b}{2}} \right)^2} + {\left( {a - \dfrac{c}{2}} \right)^2} + {\left( {a - \dfrac{d}{2}} \right)^2} + {\left( {a - \dfrac{e}{2}} \right)^2} \ge 0\)
B.\({\left( {b - \dfrac{a}{2}} \right)^2} + {\left( {c - \dfrac{a}{2}} \right)^2} + {\left( {d - \dfrac{a}{2}} \right)^2} + {\left( {e - \dfrac{a}{2}} \right)^2} \ge 0\)
C.\({\left( {b + \dfrac{a}{2}} \right)^2} + {\left( {c + \dfrac{a}{2}} \right)^2} + {\left( {d + \dfrac{a}{2}} \right)^2} + {\left( {e + \dfrac{a}{2}} \right)^2} \ge 0\)
D.\({\left( {a - b} \right)^2} + {\left( {a - c} \right)^2} + {\left( {a - d} \right)^2} + {\left( {a - e} \right)^2} \ge 0\)
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Hóa Học lớp 12
