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2X+5.4=15.4 7x-5x=12.6 9-x=15/14(是分数15分之14) 12.75-5x=4分之3 (在线等,快点!!急!!!大神们
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推荐答案 2014-08-11
2X+5.3=15.4,即2X=10.1, X=5.05 7X-5X=12.6, 即2X=12.6, X=6.3, 9-X=14/15, 即X=9-14/15, X=8又1/15. 12.75-5X=3/4,即5X=12.75-0.75=12.
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