Question

Đúng ghi Đ, sai ghi S :

a) \(\dfrac{4}{5}\) - \(\dfrac{3}{10}\) - \(\dfrac{7}{20}\) = \(\dfrac{3}{20}\) ......                     b) \(\dfrac{2}{5}\) x \(\dfrac{1}{3}\) x \(\dfrac{3}{8}\) < \(\dfrac{5}{120}\) ......

c) \(\dfrac{7}{5}\) : \(\dfrac{14}{15}\) x \(\dfrac{2}{3}\) = 1 ......                         d) \(\dfrac{9}{4}\) - \(\dfrac{3}{4}\) x \(\dfrac{1}{5}\) = \(\dfrac{3}{10}\) ......

Answer 1

\(a,Đ\\ b,-S\\=\dfrac{2\times1\times3}{5\times3\times8}=\dfrac{1}{20}>\dfrac{5}{120}\\ c,Đ\\ d,S\\ =\dfrac{9}{4}-\dfrac{3}{20}=\dfrac{9\times5-3}{20}=\dfrac{21}{10}\)

Answer 2

Answer 3

a,Đ

b,S

c,Đ

d,S

Answer 4

Đ S Đ S