Question

Determinati multimile A si B stiind ca: A={x € N/2x+1|15}; B={x+1 supra 2x+1/x € A}VA ROGG DAU COROANA SI 12 PUNCTE

Answer 1

2x+1 |15⇒ 2x+1∈D15⇒ 2x+1 ∈ { 1,3,5,15}⇒ 2x∈ {0,2,4,14}⇒ x∈{0,1,2,7}
A= {0,1,2,7}

x=0 ⇒ 1/1=1
x=1⇒ 1+1/2+1 = 2/3
x=2⇒ 2+1/5=3/5
x=7⇒ 7+1/15=8/15  ⇒ B = {1, 2/3 , 3/5 , 8/15}