\(15\dfrac{1}{4}:\dfrac{5}{7}-25\dfrac{1}{4}:\dfrac{5}{7}\)
\(=\dfrac{61}{4}:\dfrac{5}{7}-\dfrac{101}{4}:\dfrac{5}{7}\)
\(=\dfrac{61}{4}.\dfrac{7}{5}-\dfrac{101}{4}.\dfrac{7}{5}\)
\(=\dfrac{7}{5}.\left(\dfrac{61}{4}-\dfrac{101}{4}\right)\)
\(=\dfrac{7}{5}.\left(-10\right)\)
\(=-14\)
\(15\dfrac{1}{4}:\dfrac{5}{7}-25\dfrac{1}{4}:\dfrac{5}{7}=\dfrac{61}{4}:\dfrac{5}{7}-\dfrac{101}{4}:\dfrac{5}{7}\)
\(=\dfrac{61}{4}.\dfrac{7}{5}-\dfrac{101}{4}.\dfrac{7}{5}=\left(\dfrac{61}{4}-\dfrac{101}{4}\right).\dfrac{7}{5}=-10.\dfrac{7}{5}=-14\)
=61/4.7/5-101/4.7/5
=(61/4-101/4).7/5
=-10.7/5
=-14
