, , t0 , Δt .
Δ t, Δs , .
, , , Δs Δ t, .
1.
s(t) = 5t2 + t + 3 (s , t ). :
) t0; ) t = 2 .
'
) 1) t0 Δ t, t1 = t0 + Δ t.
2)
Δ s = s(t0 + Δ t) - s(t0) = 5(t0 + Δ t)2 + (t0 + Δ t) + 3 (5 t0 2 + t0 + 3) = 5 t0 2 +10 t0 Δ t + 5Δ t 2 + t0 + Δ t + 3 5 t0 2 t0 3 = 10 t0 Δ t + 5Δ t 2 + Δ t.
3) ( ):
4) ( ):
, t0 10 t0 + 1.
, s(t) v(t) t v (t) = 10 t + 1.
) t = - 2 , v (2) = 10 2 +1 = 21 ;
³: ) 10 t + 1; )21 .