lg20-lg2=?,

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lg20-lg2=?,lg20-lg2=?,lg20-lg2=?,lg20-lg2=lg20/2=lg10=1lg20-lg2=(1+lg2)-lg2=1

lg20-lg2=?,
lg20-lg2=?,

lg20-lg2=?,
lg20-lg2
=lg20/2
=lg10
=1

lg20-lg2
=(1+lg2)-lg2
=1