供求曲线:23=a+6.4b+50c
需求曲线:23=d+6.4e+50f
供给弹性:⊿Q/⊿Pg*Pg/Qg=0.2 → b*6.4/23=0.2
需求弹性:⊿Q/⊿Pg*Pg/Qg=-0.5 → e*6.4/23=-0.5
供给交叉弹性:⊿Q/⊿Po*Po/Qg=0.1 → c*50/23=0.1
需求交叉弹性:⊿Q/⊿Po*Po/Qg=1.5 → f*50/23=1.5
我稍微算了一下a=16.1 b=0.71875 c=0.046 d=0 e=-1.796875 f=0.69
计算不一定对,自己验算一般吧…