(1) lg 5 2 +
2
3 lg8+lg5•lg20+(lg2 ) 2
= 2lg5+
2
3 lg 2 3 +lg5(1+lg2)+(lg2 ) 2
=2lg5+2lg2+lg5(1+lg2)+(lg2) 2
=2(lg5+lg2)+lg5+lg5•lg2+(lg2) 2
=2+lg5+lg2(lg5+lg2)=3.
(2) (0.0081 ) -
1
4 -[3×(
7
8 ) 0 ] -1 × [8 1 -0.25 +(3
3
8 ) -
1
3 ] -
1
2 -10×0.02 7
1
3
= ((0.3 ) 4 ) -
1
4 - 3 -1 ×[( 3 4 ) -
1
4 +(
3
2 ) -1 ] -
1
2 -10× ((0.3 ) 3 )
1
3
=
10
3 -
1
3 (
1
3 +
2
3 ) -
1
2 -10•0.3
=
10
3 -
1
3 -3
=0.