Question

[nguyễn ngọc hà]

Giải hộ mình đi ! Rồi mình Coin cho 

Answer 1

[Trần Đức Huy]

a) \(\dfrac{20}{28}=\dfrac{20:4}{28:4}=\dfrac{5}{7}\)

=>\(\dfrac{5}{7}=\dfrac{20}{28}\)

b)\(\dfrac{1212}{1313}=\dfrac{1212:101}{1313:101}=\dfrac{12}{13}\)

=>\(\dfrac{12}{13}=\dfrac{1212}{1313}\)

c)\(\dfrac{6}{21}=\dfrac{6:3}{21:3}=\dfrac{2}{7}< \dfrac{5}{7}\)

=>\(\dfrac{5}{7}>\dfrac{6}{21}\)

d)\(\dfrac{15}{25}=\dfrac{15:5}{25:5}=\dfrac{3}{5};\dfrac{18}{24}=\dfrac{18:6}{24:6}=\dfrac{3}{4}\)

Ta có: \(5>4=>\dfrac{3}{5}< \dfrac{3}{4}=>\dfrac{15}{25}< \dfrac{18}{24}\)

Answer 2

[nguyễn ngọc hà]

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