16.【daan】d。jiexi: yinwei gdp jisuandeshishengchandezuizhongwupinhelaowudejiazhi，xianzai a、 b lianggongsisuoshengchandewupinhelaowujiazhifenbiewei 20 wanyuanhe 16 wanyuan，hejiwei 36 wanyuan，jiwei gdpzengliang。zhiyushuangfangdixiao 16 wanyuan，zhizhifu 4 wanyuanxianjin，neizhishizhifufangshi，yu gdp jiliangwuguan。
17.【daan】b。jiexi: jinsuoxingdehuobizhengceshi ad quxianxiangzuofangyidong，huidaozhijiageshuipingxiajianghechanchuxiajiang，congerjiangditonghuopengzhanglv，danchanchudexiajiangyetongshidaozhileshiyelvdeshangsheng。
18.【daan】c。jiexi: sanbumenjingjizhong，y=c+i+g。
19.【daan】a。jiexi: shehuizonggongjishizhiyidingshiqineikeyitigongjishehuideshangpinhelaowuzongliang，baokuoguoneishengchanzongzhihejinkoubufendeshangpinhelaowu。
BG真人版20.【daan】c。jiexi: duanzhouqiyouchengweijiqinzhouqi。
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