Question

Scrieti ca intervale multimile: -A={x∈R| IxI=x} -B={x∈R| IxI=-x} -C=(-1;3)U{-1;3} -D=[ 5;6]\Z.

Answer 1

IxI=x
x=x
x-x=0
x=-x
x+x=0
2x=0x=0
A={0}
B={0}
C=[-1,3]={-1,0,1,2,3}
Z={....-3,-2,-,1,0,1,2,3,4,5,6,.....}
D=Ф