帮忙解答一下这几道数学题,最好有详细过程!http://zhidao.baidu.com/question/256640715.html
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![帮忙解答一下这几道数学题,最好有详细过程!http://zhidao.baidu.com/question/256640715.html](/uploads/image/z/1143011-11-1.jpg?t=%E5%B8%AE%E5%BF%99%E8%A7%A3%E7%AD%94%E4%B8%80%E4%B8%8B%E8%BF%99%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E6%9C%80%E5%A5%BD%E6%9C%89%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B%21http%3A%2F%2Fzhidao.baidu.com%2Fquestion%2F256640715.html)
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