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Senior one mathematics solid geometry problem, good people see how to do it, the process is more detailed, urgent, urgent. . .
Make plane AA'C'C intersect plane pqdb o' o.

knowable

A'O'=0.75A'C '

AO = 0.5AC communication

AO = AO

Therefore, the side length ratio of the upper and lower bottom surfaces of the prism = 0.5: 0.75 = 2: 3.