(1) If all the solution sets are empty, then A 1, B 1, C 1, A2, B2, C2 do not need to meet the condition: A1/A2 = B1/B2 = C.

D: that's not necessary

(2) For example: a1=1=-2c1=-3, A2 =- 1b2 = 2c2 = 3.

The solution set of these two inequalities is:

X belongs to (-infinity,-1) and (3, +infinity)X belongs to (-1, 3)! Different solution sets

Acquisition: insufficient