\(\dfrac{-8}{12}=\dfrac{-8:4}{12:4}=\dfrac{-2}{3}\\ \dfrac{15}{-60}=\dfrac{15:15}{-60:15}=\dfrac{1}{-4}\\ \dfrac{-16}{-72}=\dfrac{-16:\left(-8\right)}{-72:\left(-8\right)}=\dfrac{2}{9}\\ \dfrac{35}{14.15}=\dfrac{5.7}{7.2.5.3}=\dfrac{1}{2.3}=\dfrac{1}{6}\)

-2/3

-1/4

2/9

1/6

-8/12= -2/3

15/-60= 1/-4

-16/-72= 2/9

35/14.15= 1/6

-8/12= -2/3

15/-60= 1/-4

-16/-72= 2/9

35/14.15= 1/6

-8/12 rút gọn bằng-2/3; 15/-60 =-1/4; -16/-72=2/9;35/14.15=1/6

-2/3

1/-4

2-9

1/6

\(\frac{-8}{12}=\frac{-2}{3}\)

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

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

\(\frac{35}{14.15}=\frac{1}{6}\)

\(\frac{-8}{12}=\frac{-2}{3}\\ \frac{15}{-60}=\frac{-1}{4}\\ \frac{-16}{-72}=\frac{2}{9}\\ \frac{35}{14.15}=\frac{1}{6}\)

\(-\frac{8}{12}=\frac{-8:4}{12:4}=-\frac{2}{3}\)

\(\frac{15}{-60}=-\frac{15}{60}=\frac{-15:15}{60:15}=-\frac{1}{4}\)

\(\frac{-16}{-72}=\frac{16}{72}=\frac{16:8}{72:8}=\frac{2}{9}\)

\(\frac{35}{14.15}=\frac{35}{210}=\frac{35:35}{210:35}=\frac{1}{6}\)

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

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

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

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

a) \(\dfrac{16}{24}-\dfrac{1}{3}=\dfrac{2}{3}-\dfrac{1}{3}=\dfrac{1}{3}\)

b ) \(\dfrac{4}{5}-\dfrac{12}{60}=\dfrac{4}{5}-\dfrac{1}{5}=\dfrac{4}{5}\)

c ) \(\dfrac{35}{50}-\dfrac{3}{10}=\dfrac{7}{10}-\dfrac{3}{10}=\dfrac{4}{10}=\dfrac{2}{5}\)

d ) \(\dfrac{21}{28}-\dfrac{1}{4}=\dfrac{3}{4}-\dfrac{1}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)

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

giúp mik đi mà các bạn ơi

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

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

dài zợ

1. D

2. D

3. A

4. A

5. D

6. B

7. D

8. C

1. D

2. D

3.A

4.B

5.D

6.B

7.D

8.C

Câu 1. D

Câu 2. D

Câu 3. A

Câu 4. B (Chưa chắc)

Câu 5. D Câu 6. B

Câu 7. D

Câu 8. C