Question

Rút gọn biểu thức sau:

\(\dfrac{5.6}{9.35}\)

\(\dfrac{7.2+8}{2.14.5}\)

Answer 1

\(\dfrac{5.6}{9.35}=\dfrac{5.3.2}{3.3.5.7}=\dfrac{2}{3.7}=\dfrac{2}{21}\)

\(\dfrac{7.2+8}{2.14.5}=\dfrac{7.2+8.2}{2.7.2.5}=\dfrac{\left(7+8\right).2}{2.7.2.5}=\dfrac{15.2}{2.7.2.5}=\dfrac{3.5.2}{2.7.2.5}=\dfrac{3}{14}\)

Answer 2

1,\(\dfrac{5.6}{9.35}\) = \(\dfrac{5.2.3}{3.3.5.7}\) = \(\dfrac{2}{3.7}\)

2, \(\dfrac{7.2+8}{2.14.5}\) = \(\dfrac{7.2+2.4}{2.14.5}\) = \(\dfrac{2\left(7+4\right)}{2\left(14.5\right)}\) = \(\dfrac{2.11}{2.70}\)= \(\dfrac{11}{70}\)

Answer 3

\(\dfrac{7.2+4.2}{2.14.5}=\dfrac{2\left(7+4\right)}{2.14.5}\)=\(\dfrac{11}{70}\)