問(wèn)答題

設(shè)函數(shù)f(z)和g(z)分別以點(diǎn)z0為m階和n階極點(diǎn),問(wèn)對(duì)于下列函數(shù)而言,z0是何種性質(zhì)的點(diǎn)?
(1)f(z)g(z)
(2)f(z)/g(z)
(3)f(z)+g(z)


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