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Help rpďďdddddd coroana dau ex 6

Help Rpďďdddddd Coroana Dau Ex 6 class=

Răspuns :

Mikkka
x+2/50⇒ x+2∈{1,2,5,10,25,50}⇒ x∈{0,3,8,23,48}, dar 3/x⇒ x∈{0,3,48}
A={0, 3, 48}

2x+3/18⇒ 2x+3∈ { 1,2,3,6,9,18}⇒ 2x∈ {0,3,6,15}⇒ x∈{0,3} ⇒ B={0,3}

4≤2x<7 / +1⇒ 5≤2x+1<8 , dar 2x+1/7⇒ 2x+1=7⇒ 2x=7-1⇒ 2x=6⇒x=3
C={3}

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