Question

Tìm các số nguyên x thoả mãn: 2013=/x-4/+/x-10/+/x+101/+/x+990/+/x+1000/

Answer 1

Ta co /x-4/+/x-10/+/x+101/+/x+990/+/x+1000/= /x+101/+/x-4/+/x-10/+/x+990/+/x+1000/= /x+101/+/x-4/+/x-10/+/x+990/+/x+1000/

>= /x+101/+/x-4+x-10+x+990+x+1000/=/x+101/+2013

=> 2013>=/x+101/+2013=.> /x+101/=<0

ma /x+101/>=0nen/x+101/=0=.>x=-101

Answer 2

Sai rồi bạn ơi

Nếu :2013=|x-4|+|x-10|+|x+10|+|x+101|+|x+999|+|x+1000| thì mới đúng​