99.9x7.78十33.3x6.66怎么简算
人气：481 ℃ 时间：2019-12-01 13:46:30
解答
原式=33.3x3x7.78+33.3x6.66
=33.3x(3x7.78+6.66)
=33.3x(23.34+6.66)
=33.3x30
=999
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