手机旧了不要扔！旧手机还有8大妙用！
想必大家手里都有几部淘汰了的智能手机吧？现在的智能手机更新速度快，很多喜欢尝鲜的人总会忍不住买了换，换了买的，结果最后手里都会有那么几部旧手机，那么怎么去处理呢？稍微动动脑其实会发现旧的智能机其实还可以用到生活的方方面面，也算是变废为宝吧！
det (2A) = 2 det(A) is it true?
det (2A) = 2 det(A) Prove it is true or false. So from above we can see tat the statement is false. However ....... matrix 1x1, [9] Although the general equation is false, but in matrix 1x1 with specific example have proven that the statement is true. So we can conclude that the statement is sometime false.
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