138。 In a certain business, production index p is directly proportional to efficiency index e, which is in turn directly proportional to investment index i. What is p if i=70? (1) e=0.5 whenever i=60 (2) p=2.0 whenever i=50 答案B 已知題目條件如下: 地 [attachimg=279,154]76367[/attachimg]請問將條件(1)寫成這樣對不對? P1和P2中至少要有一個知道 才能條件(1)充分對吧