Răspuns:
Explicație pas cu pas:
xy+5 l xy5xy
xy5xy= 1.000 xy +500+xy= 1.001 xy +500
-
xy+5 l 1.001 xy+500
xy+5 l xy +5
xy+5 l 1.001 *( xy+5)
xy+5 l 1001xy+ 5.005
xy+5 l ( 1.001 xy +5.005 ) - ( 1.001 xy +500)
xy+5 l 1001 xy +5.005 - 1.001 xy -500
xy+5 l 5.005-500
xy+5 l 4.505
xy+5 ∈ D₄₅₀₅= { 1,5,17 ,53, 85 ,265 , 901 , 4.505 } :5
xy∈{12 , 48 ,80 }
12+48+80 = 140 (a)