-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

2/5,2/3,3/7,1/3,12/25

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

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

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

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

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

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

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

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

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

a: Các phân số tối giản là \(\dfrac{1}{3};\dfrac{4}{7};\dfrac{72}{73}\) vì ƯCLN(1;3)=1; ƯCLN(4;7)=1; ƯCLN(72;73)=1

b:

Các phân số rút gọn được là

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

\(\dfrac{30}{36}=\dfrac{30:6}{36:6}=\dfrac{5}{6}\)

a) \(\dfrac{56}{42}=\dfrac{28}{21}=\dfrac{4}{3}\)

\(\dfrac{16}{24}=\dfrac{2}{3}=\dfrac{8}{12}=\dfrac{40}{60}\)

b) \(\dfrac{40}{25}=\dfrac{8}{5}\)

\(\dfrac{63}{81}=\dfrac{7}{9}\)

\(\dfrac{36}{60}=\dfrac{3}{5}\)

-2/3

4/7

-5/3

1/3

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

\(\dfrac{400}{700}=\dfrac{4}{7}\)

\(\dfrac{-10}{6}=\dfrac{-5}{3}\)

\(\dfrac{-35}{-105}=\dfrac{35}{105}=\dfrac{1}{3}\)

a. Mẫu số chung nhỏ nhất là 24

b. \(\dfrac{5}{7}\)

c. \(\dfrac{3}{4}\)

d. \(\dfrac{9}{12}\) và giữ nguyên phân số còn lại

e. \(\dfrac{3}{6};\dfrac{4}{6};\dfrac{5}{6}\)

g. \(\dfrac{9}{12};\dfrac{4}{12};\dfrac{2}{12}\)

h. \(\dfrac{15}{60};\dfrac{20}{60};\dfrac{12}{60}\)

i. \(\dfrac{10}{1}\)

\(\dfrac{60}{72}=\dfrac{60:12}{72:12}=\dfrac{5}{6}\\ \dfrac{70}{95}=\dfrac{70:5}{95:5}=\dfrac{14}{19}\\ \dfrac{150}{360}=\dfrac{150:30}{360:30}=\dfrac{5}{12}\)

\(\dfrac{60}{72}=\dfrac{5}{6}\)

\(\dfrac{70}{95}=\dfrac{14}{19}\)

\(\dfrac{150}{360}=\dfrac{5}{12}\)

giúp mình với ạ, mình sẽ tick. Cảm ơn các bạn!

`->C` 

`34/51= (34: 17)/(51:17)=2/3`

`->D`

`9/16 +1/4= 9/16+ 4/16=13/16`

a. C. \(\dfrac{34}{51}\)

b. D.\(\dfrac{13}{16}\)