Question

Rút gọn các phân số sau:

a)\(\dfrac{13.9-13.2}{25-12}\) b) \(\dfrac{42-14.8}{7+21.3}\)

c)\(\dfrac{9.6-18.4}{12.3}\)

d)\(\dfrac{5.5^2}{9.10^2-4.10^2}\)

Answer 1

a: \(=\dfrac{13\cdot\left(9-2\right)}{13}=7\)

b: \(=\dfrac{14\left(3-8\right)}{7\left(1+3\cdot3\right)}=2\cdot\dfrac{-5}{10}=-1\)

c: \(=\dfrac{54-72}{36}=\dfrac{-18}{36}=-\dfrac{1}{2}\)

d: \(=\dfrac{5^3}{10^2\cdot5}=\dfrac{5^2}{100}=\dfrac{1}{4}\)