Question

a) Thời gian nào dài hơn : \(\dfrac{1}{2}\) giờ hay \(\dfrac{4}{5}\) giờ

b) Đoạn thẳng nào ngắn hơn : \(\dfrac{2}{3}\) mét hay \(\dfrac{3}{5}\) mét

c) Khối lượng nào lớn hơn : \(\dfrac{6}{7}\) kg hay \(\dfrac{7}{8}\) kg

Answer 1

a) \(\dfrac{4}{5}\) giờ dài hơn

b) \(\dfrac{3}{5}\) mét ngắn hơn

c) \(\dfrac{7}{8}\) kg lớn hơn

Answer 2

a, \(\dfrac{1}{2}\)= \(\dfrac{5}{10}\) giờ \(\dfrac{4}{5}\)= \(\dfrac{8}{10}\)giờ

=> \(\dfrac{1}{5}\) < \(\dfrac{4}{5}\)

Vậy \(\dfrac{4}{5}\)giờ dài hơn \(\dfrac{1}{2}\) giờ

b, \(\dfrac{2}{3}\)m = \(\dfrac{10}{15}\) m \(\dfrac{3}{5}\) m = \(\dfrac{9}{15}\) m

=>\(\dfrac{10}{15}\) > \(\dfrac{9}{15}\)

Vậy \(\dfrac{2}{3}\) mét dài hơn \(\dfrac{3}{5}\) mét

c, \(\dfrac{6}{7}\) kg = \(\dfrac{48}{56}\)kg \(\dfrac{7}{8}\)kg = \(\dfrac{49}{56}\)kg

=> \(\dfrac{48}{56}\)kg < \(\dfrac{49}{56}\)kg

Vậy \(\dfrac{6}{7}\)kg nhỏ hơn \(\dfrac{7}{8}\)