numbers from 1 to 9 are used to form three formulas.eachn number can only be used for once.and only plus sign and multiple sing can be used.please write down the three formulas.求求大家了.
人气：269 ℃ 时间：2020-01-29 15:22:01
解答
用1到9的数字用来组成三个通式.每个数字只能用一次,只可以使用加号和乘号,请写下三个通式.
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