初一数学解答题初一数学解答题一下

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讲解某钢铁厂月份产钢铁560吨二月份起由于改进操作技术使第季度共产钢铁1850吨问二月份平均每月增率少(若设二三月份平均增率X)某房屋发公司发建设住宅面积由20055万平200715万平米(设两该房屋发建设住宅面积平均增率X)两道题何列程讲解拜托
提问者采纳
1.月份钢铁产量560二月份560(1+x)三月份560(1+x)^2于程560+560(1+x)+560(1+x)^2=1850解二程负数解舍x=9.8%2.每增x于每都前1+x倍于5(1+x)^2=15解(舍负根)x=73.2%
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非常感谢!
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二月份平均每月增率x,560+560(1+x)+560(1+)^2=1850,设两该房屋发建设住宅面积平均增率X,5(1+x)^2=15
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