無(wú)
*注意事項(xiàng):
①當(dāng)時(shí),該函數(shù)是一次函數(shù);
②若點(diǎn)在該函數(shù)圖象上,且 , 則;
③若該函數(shù)不經(jīng)過(guò)第四象限,則;
④該函數(shù)恒過(guò)定點(diǎn) .
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