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Ka=\frac{[H^ ][A^-]}{[HA]}
\purinev{4==NH$\mathrm{_2}$;6==H;2==H;1==H}
lnC=-ke\cdot t lnC_0
\frac{2.0 1.9}{(1.8-1.7)\times(1.6-1.5)\times(1.4-1.3)\times(1.2-1.1)}=39000
\sum_{k=1}^n \prod_{l=1}^m (k l-1)=\frac{1}{m 1}\prod_{l=1}^{m 1}(n l-1)