oblicz x jeśli (5,9,2x-1) tworzą ciąg arytmetyczny
potrzebne na zaraz
5, 9, 2x - 1
9 - 5 = 2x - 1 - 9
4 = 2x - 10
4 + 10 = 2x
2x = 14
x = 7 ----- odpowiedx
5
9
2x-1
9-5=2x-1-94=2x-10
-2x=-4-10
-2x=-14 / : -2
x=7
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5, 9, 2x - 1
9 - 5 = 2x - 1 - 9
4 = 2x - 10
4 + 10 = 2x
2x = 14
x = 7 ----- odpowiedx
5
9
2x-1
9-5=2x-1-9
4=2x-10
-2x=-4-10
-2x=-14 / : -2
x=7