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2.25×四分之十五-2.75×四分之九+3×225%
人气:279 ℃ 时间:2020-01-28 22:10:00
解答
2.25×四分之十五-2.75×四分之九+3×225%
=2.25×3.75-2.75×2.25+2.25×3
=2.25×(3.75-2.75+3)
=2.25×4
=9
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