С20=С1+19д
С5=С1+4д
С1+19д=47
С1+4д=2 ⇒15д=45⇒д=3
С1+4*3=2⇒С1+12=2⇒С1=-10
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С20=С1+19д
С5=С1+4д
С1+19д=47
С1+4д=2 ⇒15д=45⇒д=3
С1+4*3=2⇒С1+12=2⇒С1=-10