Question

ma puteți ajuta e urgent dau coroana ​

Answer 1

a) A={x€N/10<x<15} şi B={x€N/7<x<14} =>

A = {10,11,12,13,14}

B = {7,8,9,10,11,12,13,14}

A intersectat cu B = {10,11,12,13,14} = A => A C B

b) A={x€N/x divizor propriu al lui 18} şi B={x€N/54/x}

A = {18}

B = {1,2,3,6,9,18,27,54}

A intersectat cu B = {18} = A => A C B

c) Nu se vede clar A-ul

d) A={x€Z/|x+3|<5} şi B={x€Z/|x|<7}

A = {-4,-3,-2,-1,0,1}

B = {-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7}

A interectat cu B = {-4,-3,-2,-1,0,1} = A => A C B

e) A={x€N/4x+11>67} şi B={x€N/7x-5>72}

4x+11>67 => 4x>56 => x>14

A€(14,infinit)

7x-5>72 => 7x>77 => x>11

B€[11, infinit)

A intersectat cu B € (14,infinit) = A => A C B

f) A={x€N/(x^2-3)|22} şi B={x€Z/|x|<5}

(x^2-3)|22 => x^2|25 => x^2|5^2 => x = 5

A = 5

B = {-5,-4,-3,-2,-1,0,1,2,3,4,5}

A intersectat cu B = 5 = A => A C B