$\textit{$\dfrac{12}{19}$×$\dfrac{4}{13}$-$\dfrac{4}{19}$×$\dfrac{-1}{13}$+$999\dfrac{15}{19}$}$

=$\textit{$\dfrac{4}{19}$×$\dfrac{12}{13}$-$\dfrac{4}{19}$×$\dfrac{-1}{13}$+$\dfrac{18996}{19}$}$

=$\textit{$\dfrac{4}{19}$×($\dfrac{12}{13}$-$\dfrac{-1}{13}$)+$\dfrac{18996}{19}$}$

=$\textit{$\dfrac{4}{19}$×$\dfrac{18996}{19}$}$

=$\textit{1000}$

$\textit{1,25×$\dfrac{7}{19}$+$\dfrac{5}{4}$×$\dfrac{15}{19}$-$1\dfrac{1}{4}$×$\dfrac{3}{19}$}$

=$\textit{$\dfrac{5}{4}$×$\dfrac{7}{19}$+$\dfrac{5}{4}$×$\dfrac{15}{19}$-$\dfrac{5}{4}$×$\dfrac{3}{19}$}$

=$\textit{$\dfrac{5}{4}$×($\dfrac{7}{19}$+$\dfrac{15}{19}$-$\dfrac{3}{19}$)}$

=$\textit{$\dfrac{5}{4}$×1}$

=$\dfrac{5}{4}$