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nodes as well, p(x_1)=a_1, etc. In matrix form:
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[3]国民总收入，原称国民生产总值，是指一个国家或地区所有常住单位在一定时期内所获得的初次分配收入总额，等于国内生产总值加上来自国外的初次分配收入净额。