Question

Enumerati elementele multimilor :
c) C={x=abc / 80 < x < 600}
g) G={ x / x apartine N , 5^x = 125 sau 2^x = 1 }

Answer 1

c) C={x=abc / 80 < x < 600}

abc numar de 3 cifre si abc<600

x∈{100; 101; 102; ……; 599}

C={100; 101; 102; ……; 599}

card C=599-100+1=500

g) G={ x / x apartine N , 5^x = 125 sau 2^x = 1 }

5^x = 125=> x=3

2^x = 1=> x=0

G={0; 3}; card G=2