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determinati numerele naturale care verifica relatiile: a) (x+3)-(120-70)≥50 b) (75-40)-(x+5) ≥0 c) (21-17)-(5-x)<0 d) (527-432)-(x+15)≥50

Răspuns :

Daniela1607ask
a)x+3-50≥50⇒x≥97⇒x ∈ {97,98,99,100,...}
b)35-x-5≥0⇒x≤30⇒x ∈{0,1,2,...,30}
c)4-5+x<0⇒x<1⇒x ∈ {0}
d)95-x-15≥50⇒80-50≥x⇒30≥x⇒x≤30⇒x ∈{0,1,2,...,30}

Mihaelapask
a) x + 3 - 50 ≥ 50
x ≥ 50 + 47
x ≥ 97
x≥50 => x ∈ {97, ...}
b) 35 - x - 5 ≥ 0
x ≥ 30 
c) 4 - 5 + x < 0
x < 1
d) 95 - x - 15 ≥ 50
x ≥80 - 50
x≥ 30 

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