化简:a-2a+3a-4a+.+99a-100a怎么算
人气:259 ℃ 时间:2019-10-01 19:57:44
解答
a-2a+3a-4a+.+99a-100a
=(a-2a)+(3a-4a)+.+(99a-100a)
共50个括号,每个括号里面是-a
=-a*50
=-50a
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