<img class="kfformula" src="20190808/1565256297772060.png" data-latex="\sqrt {\left ( {lg5-1} \right )^{2}}"/>的值等于( )
①
<img class="kfformula" src="20190808/1565256297983776.png" data-latex="lg\frac {1} {5}"/>
②
<img class="kfformula" src="20190808/1565256297148379.png" data-latex="lg5-1"/>
③
<img class="kfformula" src="20190808/1565256297764160.png" data-latex="lg5"/>
④
<img class="kfformula" src="20190808/1565256297303551.png" data-latex="lg2"/>