小明向东走了2cm,有向东走了3cm,接着又向西走了9cm,向东为正,向西为负,小明一共走了多少米?
题目
小明向东走了2cm,有向东走了3cm,接着又向西走了9cm,向东为正,向西为负,小明一共走了多少米?
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举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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