求证:若非齐次线性方程组Ax=b有解,则它有惟一解的充要条件是它的相伴齐次线性方程组Ax=0只有零解.
[证明]若Ax0有非零解,则必有无穷多组解,于是Ax=b也有无穷多组解.反之若Ax=0只有零解,则Ax=b只有一组解.
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
One important( )of the Coast Guard is to make sure that all ships dutifully follow traffic rules in busy harbors. (responsible)
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