Question

Giúp mình bài 3 với vài 5 ạ mình đang cần gấp!!

Answer 1

Bài 5

a) \(\dfrac{20}{-30}.\dfrac{5}{4}=\dfrac{4.5}{-6.5}.\dfrac{5}{4}=\dfrac{-5}{6}\)

b) \(\dfrac{16}{-12}.\dfrac{6}{-8}=\dfrac{4}{-3}.\dfrac{3}{-4}=1\)

c) \(\dfrac{8}{15}:\dfrac{16}{45}=\dfrac{8}{15}.\dfrac{45}{16}=\dfrac{8}{15}.\dfrac{15.3}{8.2}=\dfrac{3}{2}\)

d) \(\dfrac{36}{25}:-\dfrac{27}{100}=\dfrac{36}{25}.-\dfrac{100}{27}=\dfrac{9.4}{25}.\dfrac{25.\left(-4\right)}{9.3}=4.\left(-\dfrac{4}{3}\right)=-\dfrac{16}{3}\)