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100-123.1*0.3怎么简便?
人气:250 ℃ 时间:2020-04-08 05:55:53
解答
100-123.1*0.3
=100-(100+23.1)×0.3
=100-100×0.3-23.1×0.3
=100-30-6.93
=63.07
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