(lg3+2lg2-1)除以lg1.2=?

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(lg3+2lg2-1)除以lg1.2=?
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(lg3+2lg2-1)除以lg1.2=?
(lg3+2lg2-1)除以lg1.2=?

(lg3+2lg2-1)除以lg1.2=?
(lg3+2lg2-1)/lg1.2
=(lg3+lg4-lg10)/lg1.2
=(lg12-lg10)/lg1.2
=lg1.2/lg1.2
=1