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![\left[\begin{array}{ccc}1&-2\\3&4&\\\end{array}\right] . \left[\begin{array}{ccc}1&0\\0&1\\\end{array}\right] \\ \\ \left[\begin{array}{ccc}1(1)+(-2)(0)&1(0)+(-2)1\\3(1)+4(0)&3(0)+4(1)\\\end{array}\right] \\ \\ \left[\begin{array}{ccc}1-0&0-2\\3+0&0+4\\\end{array}\right] \\ \\ \left[\begin{array}{ccc}1&-2\\3&4\\\end{array}\right]](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26-2%5C%5C3%264%26%5C%5C%5Cend%7Barray%7D%5Cright%5D+.++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%260%5C%5C0%261%5C%5C%5Cend%7Barray%7D%5Cright%5D+%5C%5C++%5C%5C+++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%281%29%2B%28-2%29%280%29%261%280%29%2B%28-2%291%5C%5C3%281%29%2B4%280%29%263%280%29%2B4%281%29%5C%5C%5Cend%7Barray%7D%5Cright%5D+++%5C%5C++%5C%5C+++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1-0%260-2%5C%5C3%2B0%260%2B4%5C%5C%5Cend%7Barray%7D%5Cright%5D++%5C%5C++%5C%5C+++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26-2%5C%5C3%264%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}1&-2\\3&4&\\\end{array}\right] . \left[\begin{array}{ccc}1&0\\0&1\\\end{array}\right] \\ \\ \left[\begin{array}{ccc}1(1)+(-2)(0)&1(0)+(-2)1\\3(1)+4(0)&3(0)+4(1)\\\end{array}\right] \\ \\ \left[\begin{array}{ccc}1-0&0-2\\3+0&0+4\\\end{array}\right] \\ \\ \left[\begin{array}{ccc}1&-2\\3&4\\\end{array}\right]")
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