a) Ta có: \(\dfrac{7\cdot25}{14\cdot10}\)
\(=\dfrac{7\cdot5\cdot5}{7\cdot2\cdot2\cdot5}\)
\(=\dfrac{5}{4}\)
b) Ta có: \(\dfrac{24\cdot15-14\cdot9}{36\cdot12}\)
\(=\dfrac{9\cdot8\cdot5-14\cdot9}{36\cdot12}\)
\(=\dfrac{9\cdot\left(8\cdot5-14\right)}{9\cdot4\cdot12}\)
\(=\dfrac{40-14}{4\cdot12}\)
\(=\dfrac{13}{24}\)
a) \(\dfrac{7.25}{14.10}\)
= \(\dfrac{7.5.5}{7.2.5.2}\)
= \(\dfrac{5}{4}\)
c) \(\dfrac{1^3.3^2}{6^3.5}\)
= \(\dfrac{3^2}{\left(2.3\right)^3.5}\)
= \(\dfrac{1}{2^3.3.5}\)
= \(\dfrac{1}{120}\)