1、奇函數(shù)乘以偶函數(shù)等于奇函數(shù)。2、此外，偶函數(shù)乘以偶函數(shù)還等于偶函數(shù)，奇函數(shù)乘以奇函數(shù)等于偶函數(shù)。函數(shù)的奇偶性也就是指關(guān)于原點(diǎn)的對(duì)稱(chēng)點(diǎn)的函數(shù)值相等，這是屬于函數(shù)的基本性質(zhì)，也就是它們的圖象有某種對(duì)稱(chēng)性的一元函數(shù)。