回复：正确！继续扩充，能否用2个1算出24？再允许..

[sqrt(sqrt((1/.i)!))]
=[sqrt(sqrt(9!))]
=[sqrt(sqrt(362880))]
=[sqrt(602.39521910453439454428385856533...)]
=[24.543740935410282205399173128888...]
=24

如果允许取自然对数的话：

[ - ln ( .1 ) - ln ( .1 ) ] ! = [ 2.303 + 2.303 ] ! = 4 ! =24