急(lg根号下27+lg8-lg根号下1000）\lg1.2=（3/2lg3+3lg2-3/2)/l

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=（3/2lg3+3/2lg4-3/2)/lg1.2=3/2lg(3*4/10)/lg1.2=3/2
======以下答案可供参考======
供参考答案1:
(lg√27+lg8-lg√1000)/lg1.2
=lg(√27*8/√1000)/lg1.2
=lg[6√6/(5√5)] /lg(6/5)
=log(6/5)[6√6/(5√5)]
=log(6/5)[(6/5)^(3/2)]
=3/2