a) \(\dfrac{2.5.13}{26.35}\)= \(\dfrac{2.5.13}{2.13.5.7}\)= \(\)\(\dfrac{1}{7}\)
b) \(\dfrac{2.\left(-13\right).9.10}{\left(-3\right).4.\left(-5\right).26}\)=\(\dfrac{2.\left(-13\right).3.3.\left(-2\right).\left(-5\right)}{\left(-3\right).4.\left(-5\right).\left(-13\right).\left(-2\right)}\)= \(\dfrac{-3}{2}\)
c) \(\dfrac{9.6-9.3}{18}\)= \(\dfrac{9.\left(6-3\right)}{18}\)= \(\dfrac{9.3}{18}\)=\(\dfrac{3}{2}\)