Question

Promit ca nu sunt atât de proasta doar ca mai am teme și la limbile străine ​

Answer 1

A = {6, 12, 18, 24, 30, 36}

B = {3, 27, 243}

C = {0, 1, 2, 3, 4, 5, 8, 11}

Answer 2

Răspuns:

a) A={multimea multiplilor pari ai lui 3 mai mici decat 40}

A={$M_{3} <40$}

$M_{3} ={0,3,6.9,12,15,18,21,24,27,30,33,36,39}<40$

A={0,3,6,9,12,15,18,21,24,27,30,33,36,39}

b)B={x∈N, x=$3^{a}$,unde a este cifra impara mai mica decat 6}

x=$3^{a}$

a-cifra impara<6⇒a={1,3,5}

$x=3^{1} =3\\x=3^{3} =27\\x=3^{5} =243$

B={3,27,243}

c) C={x∈N I x-3=8 sau 2x+2=18 sau x+1≤6}

x-3=8⇒x=11

2x+2=18⇒2x=16⇒x=8

x+1≤6⇒x≤5, x∈N⇒x={0,1,2,3,4,5}

X={11}∪{8}∪{0,1,2,3,4,5}⇒x={0,1,2,3,4,5,8,11}

C={0,1,2,3,4,5,8,11}