Question

{x|xe N si x
B) {0,1,2}reunit cu {x|xe N si x<5

C) {x| xx bara deasupra:3}-{77,88,99}

Answer 1

{0,12}U{0,1,2,3,4}={0,1,2,3,4}                                 {33,66,99}\{77,88,99}={33,66}