Question

[Trần Lê Việt Hoàng]

Bài 3: Rút gọn các phân số sau đến tối giản:

Answer 1

[Adorable Angel]

a) \(\dfrac{2.5.13}{26.35}=\dfrac{2.5.13}{13.2.5.7}=\dfrac{1}{7}\)

b) \(\dfrac{2.\left(-13\right).9.10}{\left(-3\right).4.\left(-5\right).26}=\dfrac{2^2.\left(-1\right).13.3^2.5}{\left(-1\right).3.2^3.\left(-1\right).5.13}=\dfrac{3}{-2}=\dfrac{-3}{2}\)

Answer 2

[Phạm Thị Bích Hạ]

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) \(\dfrac{9.6-9.3}{18}\)= \(\dfrac{9.\left(6-3\right)}{18}\)= \(\dfrac{9.3}{18}\)=\(\dfrac{3}{2}\)

d) \(\dfrac{17.5-17}{3-20}\)= \(\dfrac{17.\left(5-1\right)}{-17}\)= \(\dfrac{17.4}{-17}\)= -4