国民平均收入x 人口平均资金积累y y=mx 总资金a，则da（t）/dt=k 人口n， 则dn（t）/dt=r 题即证明当k>r时，x才会增长

matlab作业\牛子孺、宋小建、熊建清的数学建模作业\matlab作业\anser\ans30.m
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..........\牛子孺、宋小建、熊建清的数学建模作业
matlab作业

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