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The drow spell-like abilities don't have any direct influence upon your sorcerer spells; the two groups function separately from eachother.
You're able to use each drow spell-like ability 1/day. You can't use sorcerer spell slots to cast more of them unless you choose to learn them as part of your regular spells known.
Edit: If you refer to the three drow spells in the Advanced Race Guide, those are simply options available to drow casters that aren't available to other casters. You must still choose to learn them as part of your regular spells known in order to use them.