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2.25×15/4-2.75×9/4+3×225%简算
人气:180 ℃ 时间:2020-01-29 00:32:43
解答
2.25×15/4-2.75×9/4+3×225%
=2.25×(3.75-2.75+3)
=2.25×4
=9
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