Question

fie a={x|x cifra para } b={x|x cifra impara c={x|x€N 3x-2<10} calculați A,B,C AUB AUC BUC

Answer 1

A = {0,2,4,6,8}
B = {1,3,5,7,9}

3x-2<10
3x<10+2
3x<12
x<12:3
x<4
C={0,1,2,3}
A U B={0,1,2,3,4,5,6,7,8,9}
A U C = {0,1,2,3,4,6,8}
B U C={0,1,2,3,5,7,9}