两个函数复合，加减乘除，奇偶性，增减性关系，谁总结一下，不用证明。 麻烦帮总结下 奇偶函数的加减，乘除分别得什么奇偶性的函数。还...
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同奇同偶相加减，奇偶性不变，奇偶相加减非奇非偶，同奇同偶相乘除为偶，奇偶相乘除为奇
两个函数复合，同增异减。增加增为增，减加减为减，增减减为增，减减增为减，奇偶函数把奇类比负数，偶类比正数
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