已知 e 1 ⇀ , e 2 ⇀ 是空间单位向量, e 1 ⇀ · e 2 ⇀ = 1 2 ,若空间向量 b ⇀ 满足 b ⇀ · e 1 ⇀ = 2 , b ⇀ · e 2 ⇀ = 5 2 ,且对于任意 x , y ∈ R , b ⇀ - ( x e 1 ⇀ + y e 2 ⇀ ) ≥ b ⇀ - ( x 0 e 1 ⇀ + y 0 e 2 ⇀ = 1 , ( x 0 , y 0 ∈ R ) ,则 x 0 = , y 0 = , b ⇀ = .
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