Question

1/ Rút gọn phân số 

a, 7*25/14*10

b, 24*15-14*9/36*12

c, 1^3*3^2/6^3*5

Các bn giúp mik vs nhá ^^ mik cảm ơn

Answer 1

a) Ta có: \(\dfrac{7\cdot25}{14\cdot10}\)

\(=\dfrac{7\cdot5\cdot5}{7\cdot2\cdot2\cdot5}\)

\(=\dfrac{5}{4}\)

b) Ta có: \(\dfrac{24\cdot15-14\cdot9}{36\cdot12}\)

\(=\dfrac{9\cdot8\cdot5-14\cdot9}{36\cdot12}\)

\(=\dfrac{9\cdot\left(8\cdot5-14\right)}{9\cdot4\cdot12}\)

\(=\dfrac{40-14}{4\cdot12}\)

\(=\dfrac{13}{24}\)

Answer 2

a) \(\dfrac{7.25}{14.10}\)

= \(\dfrac{7.5.5}{7.2.5.2}\)

= \(\dfrac{5}{4}\)

c) \(\dfrac{1^3.3^2}{6^3.5}\)

= \(\dfrac{3^2}{\left(2.3\right)^3.5}\)

= \(\dfrac{1}{2^3.3.5}\)

= \(\dfrac{1}{120}\)