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\scriptstyle \sum \frac 1{n(n+1)} \quad \sum \frac 1{n(n+2)}
V(t)=\frac{X(t \Delta t)-X(t)}{\Delta t}=\frac{\Delta X}{\Delta t}=\frac{dX}{dt}=\frac{d}{dt}X(t)\ \ \ (\Delta t \rightarrow0)
\frac{X(t \Delta t)-X(t)}{(t \Delta t)-t}=\frac{X(t \Delta t)-X(t)}{\Delta t}=V(t)\ \ (\Delta t \rightarrow0)
A=\sqrt{B C}
lnC=-ke\cdot t lnC_0