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10楼#
发布于：2016-12-26 22:02
选B，甲每天植x棵，乙每天就植x+2棵，一共植的棵数除以每天植的数量就是天数了，等式关系就出来了
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![7天勇士[秋]](https://bbs.jd100.com/attachment/medal/d73ac334c487136.jpg "7天勇士[秋]"){kind=small}
![14天勇士[秋]](https://bbs.jd100.com/attachment/medal/295c62a2b4d041f.jpg "14天勇士[秋]"){kind=small}
![21天勇士[秋]](https://bbs.jd100.com/attachment/medal/541a6942efb56d6.jpg "21天勇士[秋]"){kind=small}
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11楼#
发布于：2016-12-25 20:48
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12楼#
发布于：2016-12-25 16:02
c
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