【填空题】【消耗次数:1】
不定方程ax+by=c有解的充要条件是[填空1].
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相关题目
【简答题】 不定方程ax+by+cz=d有解的充要条件是[填空].
【单选题】 非齐次线性方程组有解的充要条件是()
① 
② 
③  难确定
④  任意非零实数
【判断题】 非齐次线性方程组Ax=b有解的充要条件是其系数矩阵的秩于增广矩阵的秩相等
①  正确
②  错误
【判断题】 axob(mod m)有解的充要条件是(a, m)|b.
①  正确
②  错误
【判断题】 非齐次线性方程组Ax=b有解的充要条件是系数矩阵的秩R(A)等于增广矩阵的秩R(A|b).
①  正确
②  错误
【单选题】 设A是m*n阶矩阵,齐次线性方程组Ax=0仅有零解的充要条件是()
①  A的列向量线性无关
②  A的列向量线性相关
③  A的行向量线性无关
④  A的行向量线性相关
【判断题】 绝对连续的充要条件是它是可积函数的不定积分.
①  正确
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【判断题】 n元齐次线性方程组Ax=0有非零解的充要条件是秩R(A)=n.
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【单选题】 方阵A可逆的充要条件是
①  <img class=jc-formula data-tex=A\neq 0 src=https://huaweicloudobs.ahjxjy.cn/320176A89C56562C9EE6EF9E59F144B4.png style=vertical-align: middle;/>
②  <img class=jc-formula data-tex={ A }^{ * }\neq 0 src=https://huaweicloudobs.ahjxjy.cn/86C2FE4B86A988E3BB004472D39EBA7F.png style=vertical-align: middle;/>
③  <img class=jc-formula data-tex=\left| A \right| \neq 0 src=https://huaweicloudobs.ahjxjy.cn/DDF5A5E8A4C1CB242AB871222A74D4F9.png style=vertical-align: middle;/>
④  <img class=jc-formula data-tex=\left| A \right| =0 src=https://huaweicloudobs.ahjxjy.cn/C0FF5500641DFC6CB166CD5F7867609E.png style=vertical-align: middle;/>
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【单选题】 ______ semantics is the interface between lexicology and semantics. It is the most significant part of lexicology and is also the most robust in semantics.
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【单选题】 When making a choice of words, a speaker/writer needs to consider the following major factors EXCEPT_______.
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【单选题】 ________ words in the English language refer to words of Anglo-Saxon origin.
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