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20楼#
发布于：2013-09-15 12:52
回复看看
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21楼#
发布于：2013-09-15 09:39
p[
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22楼#
发布于：2013-09-15 09:10
jjjjjjjjjjjjjjjjjjjjjjjjjjjjj
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23楼#
发布于：2013-09-14 21:12
答案是什么？
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24楼#
发布于：2013-09-14 08:00
7=2=9
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![20天大作战[2015]](https://bbs.jd100.com/attachment/medal/cec543c13f7ea1b.jpg "20天大作战[2015]"){kind=small}
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25楼#
发布于：2013-09-14 07:59
(1) 解：a=2,b=7 (2)a=6,b=4.2/-4.2
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26楼#
发布于：2013-09-13 19:04
0000
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27楼#
发布于：2013-09-13 16:10
亲爱的张老师，我想掌握一些这类题的做法，可不可以
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![28天勇士[寒假]](https://bbs.jd100.com/attachment/medal/f7cb21a2bdf0790.jpg "28天勇士[寒假]"){kind=small}
![7天勇士[寒]](https://bbs.jd100.com/attachment/medal/3ae915c994fd934.jpg "7天勇士[寒]"){kind=small}
![14天勇士[寒]](https://bbs.jd100.com/attachment/medal/9aacf8cc0ea8134.jpg "14天勇士[寒]"){kind=small}
![21天勇士[寒]](https://bbs.jd100.com/attachment/medal/cda474e823b15b8.jpg "21天勇士[寒]"){kind=small}
![勇不止步[夏]](https://bbs.jd100.com/attachment/medal/d81a441ef64b068.jpg "勇不止步[夏]"){kind=small}
![20天大作战[2014]](https://bbs.jd100.com/attachment/medal/465e7ccd53045d5.png "20天大作战[2014]"){kind=small}
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29楼#
发布于：2013-09-12 23:28
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