People in many countries spend more and more time far away from their families. Why does this happen and what effects will it have on them and their families? Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 words. Task...
求矩阵的解,A为4阶魔方阵,。【提示】由rref可以看出A不满秩,b不在A的值空间中,方程没有准确解。但可求最小二乘近似解。【目的】A不满秩,b不在A的值空间中,方程没有准确解。【解答】(1)借助增广矩阵用指令rref求解
While you’re comparing energy suppliers with Uswitch, you might come across some brand names you haven’t heard of. Many smaller suppliers offer competitive pricing and have great customer reviews, so be sure to consider them for your energy switch. ...
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