\(\dfrac{20}{35}\text{=}\dfrac{4}{7}\)

\(\dfrac{5}{15}\text{=}\dfrac{1}{3}\)

\(\dfrac{12}{21}\text{=}\dfrac{4}{7}\)

\(\dfrac{8}{10}\text{=}\dfrac{4}{5}\)

\(\dfrac{20}{30}\text{=}\dfrac{2}{3}\)

\(\Rightarrow\left(\dfrac{20}{35}\text{=}\dfrac{12}{21}\text{=}\dfrac{4}{7}\right);\left(\dfrac{20}{30}\text{=}\dfrac{2}{3}\right).\)

4/7 = 12/21 = 20/35

HT

20/35=12/21=4/7
2/3=20/30
 

ta có :

`1/5=(1xx8)/(5xx8)=8/40`

`5/8=(5xx5)/(8xx5)=25/40`

`7/20=(7xx2)/(20xx2)=14/40`

`19/40=19/40`

`->5/8` lớn nhất 

`=>B`

help me ạ! Mình sẽ tick ah!~

Thanks

Chọn đáp án b bạn nhé

33/55; 12/20; 27/45

33/55,12/20,27/45.

\(\dfrac{33}{55};\dfrac{12}{20};\dfrac{27}{45}\)

- Các phân số còn lại ko bằng 3/5

\(\dfrac{8}{20}=\dfrac{8:4}{20:4}=\dfrac{2}{5}\)

⇒ Chọn C

Đáp án A

\(\dfrac{3}{5}và\dfrac{15}{25}và\dfrac{21}{35};\dfrac{5}{8}và\dfrac{20}{32}\)

\(\dfrac{3}{5}=\dfrac{9}{15}=\dfrac{15}{25}=\dfrac{21}{35}\\ \dfrac{5}{8}=\dfrac{20}{32}\)

\(\dfrac{3}{5}=\dfrac{15}{25}=\dfrac{9}{15}=\dfrac{21}{35};\dfrac{5}{8}=\dfrac{20}{32}\)

25/20,10/8

5/4=10/8=25/20

k mk voi nha

10/8 và 25/20 nhé bạn

20/36

\(\dfrac{20}{36}\)

20/36

12/13

11/15

12/13 và 11/15

12/13, 11/15