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