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在整式加减的计算中,有些代数式的值与其中所含字母(或部分字母)的取值无关.下面举例说明.例1试说明代数式16+a-{8a-[a-9-(3-6a)]}的值与字母a的取值无关.
In the calculation of integer addition and subtraction, some algebraic expressions are independent of the letter (or part of the letters) contained in them. Here is an example. Example 1 Test Description Algebraic expression 16+a-{8a-[a-9-(3) The value of -6a)]} has nothing to do with the value of the letter a.