【摘 要】
：
As we all know that a relation is a cor- respondence between two variables x and y. When relations are written as ordered pairs (x,y),we say that x is related t
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As we all know that a relation is a cor- respondence between two variables x and y. When relations are written as ordered pairs (x,y),we say that x is related to y.Often, we are interested in specifying the type of re- lation (such as an equation) that might exist between the two variables. For example,the relation between the revenue R resulting from the sale of x items
As we all know that a relation is a cor- respondence between two variables x and y. When relations are written as ordered pairs (x,y),we say that x is related to y.Often, we are interested in specifying the type Of relation (such as an equation) that might exist between the two variables. For example, the relation between the revenue R resulting from the sale of x items
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