1/2的lg25+lg2+lg根号10+lg(0.01)的-1次方
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1
=[lg5 + lg2+ 1/2 - 2]^(-1)
=(-1/2)^(-1)
=-2;
2
=(lg2)的平方+lg2×lg5+lg5+1
=lg2×(lg2+lg5)+lg5+1
=lg2+lg5+1
=2;
3
= -2log2对5 ×3log3对2 ×3log1/5对3
= 18×[(lg5 / lg2)×(lg2 / lg3)×(lg3 / lg5)]
=18;
4
= lg5×(1+lg2) - lg2×(1 + lg5) - 2lg5
= lg5 + lg5×lg2 - (lg2 + lg2×lg5) - 2lg5
= -lg2 - lg5
= -1
=[lg5 + lg2+ 1/2 - 2]^(-1)
=(-1/2)^(-1)
=-2;
2
=(lg2)的平方+lg2×lg5+lg5+1
=lg2×(lg2+lg5)+lg5+1
=lg2+lg5+1
=2;
3
= -2log2对5 ×3log3对2 ×3log1/5对3
= 18×[(lg5 / lg2)×(lg2 / lg3)×(lg3 / lg5)]
=18;
4
= lg5×(1+lg2) - lg2×(1 + lg5) - 2lg5
= lg5 + lg5×lg2 - (lg2 + lg2×lg5) - 2lg5
= -lg2 - lg5
= -1
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