Question

tìm x thuộc Z

( -3/2 : 3/-4 ) . ( -4 - 9/20 ) - 1/4 < x/8 < -1/2 . 3/4 : 1/8 + 1

Answer 1

( -3/2 : 3/-4 ) . ( -4 - 9/20 ) - 1/4 < x/8 < -1/2 . 3/4 : 1/8 + 1

=>2.(-89)/20-1/4<x/8<-3+1

=>(-89)/10-1/4<x/8<-2

=>-203/20<x/8<-2

=>-406/40<5x/40<-80/40

=>-406<5x<-80

=>-406:5<x<-80:5

=>-81,2<x<-16

Vì x thuộc Z

=>81,2<-81<x<-16

=>\(x\in\left\{-81;-80;-79;...;-17;-16\right\}.\)