\(5^{2016}-5^{2015}-....-5-1\)
\(=5^{2016}-\left(5^{2015}+5^{2014}+....+5+1\right)\)
\(=5^{2016}-\left(5^{2016}-1\right)\)
\(=5^{2016}-5^{2016}+1\) \(=0+1=1\)
<br class="Apple-interchange-newline"><div id="inner-editor"></div>M=52016−52015−52014−...−5−1
=>5M=5(52016−52015−52014−...−5−1)
=>