lg20=1.3010299956639811952
lg 0.5=-0.30102999566398119521
5^0.5=2.2360679774997896964
0.5^(lg20)=8.1167270498191309259
0.5^(lg0.5)=1.2320236886890061166
0.5^(lg20) * 0.5^(lg0.5)=10
设原式=x
则lg x =lg20 *lg5 +lg 0.5 *lg 0.5
=(1+lg2)*(1-lg2)+(-lg2)*(-lg2)
=1
所以 x=10
lg20=1.3010299956639811952
lg 0.5=-0.30102999566398119521
5^0.5=2.2360679774997896964
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