3000=500+0.8*(3000)+☆
=500+2400+☆
...
I = S = -500+02Y,Y帶入 => S =I = 100
順著算就好了,整那些花裏胡哨只會搞死自己
28 假設 Y = C + I,若 C = 500 + 0.8Y,試問 I 為多..-阿摩線上測驗