试证明代数式-(a-23)-{10a-[5a-15-(4-6a)]}的值与a的取值无关.
试证明代数式-(a-23)-{10a-[5a-15-(4-6a)]}的值与a的取值无关.
数学人气:936 ℃时间:2020-05-20 22:08:29
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-(a-23)-{10a-[5a-15-(4-6a)]} =-a+23-{10a-[5a-15-4+6a]} =-a+23-{10a-11a+19} =-a+23+a-19 =23-19 =4 与a的取值无关
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