Question

Tìm số  nguyên x biết

|x+2015|+|x-2016| = 4031

Answer 1

Ta có: |x+2015|+|x-2016|

        =|x+2015|+|2016-x|\(\ge\)|(x+2015)+(2016-x)|=4031

=>|x+2015|+|x-2016|\(\ge\)4031

Mà |x+2015|+|x-2016|=4031

=>(x+2015)(2016-x)\(\ge\)0

=>-2014\(\le\)x\(\le\)2015

Answer 2

x thuộc (-2013;-2012;............;2013;2014;2015)

tich ủng hộ nha