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有谁可以教我数学？？
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这是问题：
The total costs for a design project was $10,841. The project was carried out by technicians earning $137 per day and draftsmen earning $82 per day. If 98 man days were used on the project, how many man days were draftsmen employed?
谢谢。
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发表于 20-9-2015 03:08 PM
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你可以买珠心算自己学 |
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发表于 20-9-2015 03:40 PM
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本帖最后由 tat94 于 20-9-2015 04:03 PM 编辑
x+y=98 137x+82y=10841 y=98-x 137x+82(98-x)=10841 8036+137x-82x=10841 55x=2805 x=51 y=47. 47 draftman used
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发表于 20-9-2015 04:05 PM
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发表于 20-9-2015 05:28 PM
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发表于 20-9-2015 06:13 PM
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这么水皮的问题还要上来问，随便一个f1学生都会吧 |
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楼主 |
发表于 21-9-2015 12:19 AM
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