a ) 5 7 b ) − 2 3 c ) 3 5

d ) − 1 3 e ) − 5 6 f ) 10

a) \(\dfrac{2}{10}=\dfrac{2:2}{10:2}=\dfrac{1}{5}\)

b) \(\dfrac{9}{6}=\dfrac{9:3}{6:3}=\dfrac{3}{2}\)

c) \(\dfrac{5}{20}=\dfrac{5:5}{20:5}=\dfrac{1}{4}\)

d) \(\dfrac{6}{16}=\dfrac{6:2}{16:2}=\dfrac{3}{8}\)

\(a,\dfrac{3}{9}=\dfrac{1}{3}\\ \dfrac{16 }{24}=\dfrac{2}{3}\\ b,\dfrac{17}{51}=\dfrac{1}{3}=\dfrac{5}{15}\\ \dfrac{18}{90}=\dfrac{1}{5}=\dfrac{3}{15}\\ c,\dfrac{5}{10}=\dfrac{1}{2}=\dfrac{3}{6}\\ \dfrac{15}{45}=\dfrac{1}{3}=\dfrac{2}{6}\\ d,\dfrac{42}{63}=\dfrac{2}{3}=\dfrac{6}{9}\\ \dfrac{64}{72}=\dfrac{8}{9}\)

\(a.-\dfrac{8}{12}=\dfrac{-2\cdot4}{4\cdot3}=-\dfrac{2}{3}\)

\(b.\dfrac{15}{-60}=\dfrac{15}{15\cdot-4}-\dfrac{1}{4}\)

\(c.\dfrac{-16}{-72}=\dfrac{-2\cdot8}{-9\cdot8}=\dfrac{2}{9}\)

\(d.\dfrac{35}{14\cdot15}=\dfrac{7\cdot5}{7\cdot2\cdot5\cdot3}=\dfrac{1}{6}\)

\(\dfrac{8}{12}\)=\(\dfrac{2}{31}\)

\(\dfrac{15}{-60}\)=\(\dfrac{-1}{4}\)

\(\dfrac{-16}{72}\)=\(\dfrac{-2}{9}\)

\(\dfrac{35}{14.15}=\dfrac{35}{210}=\dfrac{1}{6}\)

c

giúp mình với

C

\(\frac{27}{62}\)

\(\frac{27}{62}\)

\(\dfrac{35}{210}=\dfrac{35:35}{210:35}=\dfrac{1}{6}\)

\(\dfrac{34}{68}=\dfrac{34:34}{68:34}=\dfrac{1}{2}\)

\(\dfrac{64}{720}=\dfrac{64:8}{720:8}=\dfrac{8}{90}\)

Lời giải:
$\frac{35}{210}=\frac{35}{35\times 6}=\frac{1}{6}$

$\frac{34}{68}=\frac{34}{34\times 2}=\frac{1}{2}$
$\frac{64}{720}=\frac{8\times 8}{8\times 90}=\frac{8}{90}=\frac{4\times 2}{2\times 45}=\frac{4}{45}$

a)1/6
b)1/2
c)4/45

giúp mik đi mà các bạn ơi

2/3; 5/12; 37/50; 6/7; 20/27; 2/3

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dài thế bạn

A) -2/5

B) -1

C) 2/5

D) 39/64

Câu 1: D

Câu 2: A

Câu 3: 

A: D

B: 12

D

A

D

12 phút 

1D

2A

3D

4. : 12 PHÚT