Question

Bài 1: Rút gọn ( đưa vềphân sốtối giản, có mẫu dương)

a, \(\dfrac{36}{-42}\)

b,\(\dfrac{15.49}{-7.30}\)

c,\(\dfrac{\left(-7\right)^2.3^3}{3^2.\left(-7\right)^3}\)

Answer 1

a, \(\dfrac{-6}{7}\)

b, \(\dfrac{-7}{2}\)

c, \(\dfrac{-3}{7}\)

Answer 2

a.-6/7

b.7/2

c.6/49

Answer 3

a)\(-\dfrac{6}{7}\)

b)\(-\dfrac{7}{2}\)

c)\(-\dfrac{3}{7}\)

Answer 4

a) \(\dfrac{36}{-42}=\dfrac{-36}{42}=\dfrac{-6}{7}\)

b) \(\dfrac{15\cdot49}{-7\cdot30}=-\dfrac{735}{210}=-\dfrac{7}{2}\)

c) \(\dfrac{\left(-7\right)^2\cdot3^3}{3^2\cdot\left(-7\right)^3}=\dfrac{-378}{-3087}=\dfrac{378}{3087}=\dfrac{6}{49}\)

Answer 5

a) \(\dfrac{36}{-42}=\dfrac{6}{-7}=\dfrac{-6}{7}\)

b) \(\dfrac{15.49}{-7.30}=\dfrac{15.7.7}{-7.15.2}=\dfrac{7}{-2}=\dfrac{-7}{2}\)

c) \(\dfrac{\left(-7\right)^2.3^3}{3^2.\left(-7\right)^3}=\dfrac{3}{-7}=\dfrac{-3}{7}\)