Respuesta :

nonsibi

1. 7<x<13

The range for 1/x would be from 1/13 to 1/7, the reciprocals of 7 and 13.

answer: 1/13<1/x<1/7

2. 6<a<10 -----> -10<-a<-6 -------> -8<2-a<-4

                 ×-1                      +2

answer: -8<2-a<-4

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