Liczby (5,9,2x - 1) tworzą w podanej kolejności ciąg arytmetyczny. Oblicz wartość liczby x .
18=5+2x-1
2x=14
x=7
(5, 9, 2x - 1)
a1 a2 a3
a2 - a1 = a3 - a2
9 - 5 = 2x - 1 - 9
4 = 2x - 10
4 + 10 = 2x
2x = 14
x = 7 ----- odpwoiedx
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18=5+2x-1
2x=14
x=7
(5, 9, 2x - 1)
a1 a2 a3
a2 - a1 = a3 - a2
9 - 5 = 2x - 1 - 9
4 = 2x - 10
4 + 10 = 2x
2x = 14
x = 7 ----- odpwoiedx