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16.直角坐標(biāo)系中橫坐標(biāo)、縱坐標(biāo)均為整數(shù)的點(diǎn)稱為格點(diǎn),如果函數(shù)f (x)的圖象恰好通過(guò)k個(gè)格點(diǎn),則稱函數(shù)f (x)為k階格點(diǎn)函數(shù).下列函數(shù):①;②;③;④其中是一階格點(diǎn)函數(shù)的有 ①②④ .(填上所有滿足題意的序號(hào))
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