设向量组A:α 1 ,…,α m ;B:β 1 ,…,β m ;C:γ 1 ,…,γ m 的秩分别为r 1 ,r 2 ,r 3 .如果γ i =α i -β i (i=1,…,m),证明:r 3 ≤r 1 +r 2 .
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【单选题】— I just can’t stop worrying about the school results of the midterm examination. — _______. There is nothing you can do now but study hard, keep calm and do your best.