\(\dfrac{35}{45}=\dfrac{35:5}{45:5}=\dfrac{7}{9}\)

7/9

7/9 

\(\dfrac{15}{27}=\dfrac{5}{9};\dfrac{35}{55}=\dfrac{7}{11};\dfrac{101}{909}=\dfrac{1}{9}\)

15/ 27 rút gọn thành 5/9

35/55 rút gọn thành 7/11

101/909 rút gọn thành 1/9

- Các phân số còn lại đều tối giản.

3/5 , 5/9 , 9/20 , 7/11 , 17/27 , 1/9

27/81=1/3

57/76=3/4

35/84=5/12

27/81=1/3

57/76=3/4

35/84=5/12

567895464468457899999 hư đi em 

\(=\dfrac{3}{5}\\ =\dfrac{7}{9}\\ =\dfrac{4}{3}\\ =\dfrac{9}{7}\)

\(\dfrac{6}{10}=\dfrac{3}{5};\dfrac{70}{90}=\dfrac{7}{9};\dfrac{96}{72}=\dfrac{8}{9};\dfrac{45}{35}=\dfrac{9}{7}\)

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

\(\dfrac{70}{90}=\dfrac{7}{9}\)

\(\dfrac{96}{72}=\dfrac{4}{3}\)

\(\dfrac{45}{35}=\dfrac{9}{7}\)

$\frac{{15}}{6} = \frac{{15:3}}{{6:3}} = \frac{5}{2}$

$\frac{{12}}{{16}} = \frac{{12:4}}{{16:4}} = \frac{3}{4}$

 $\frac{{35}}{{105}} = \frac{{35:35}}{{105:35}} = \frac{1}{3}$

\(3;\dfrac{-1}{5};\dfrac{-1}{3}\)

\(\dfrac{-12}{-4}=\dfrac{-3}{-1}\)

\(\dfrac{7}{-35}=\dfrac{1}{-5}\)

\(\dfrac{-9}{27}=\dfrac{-1}{3}\)

\(\dfrac{6}{10}=\dfrac{3}{5};\dfrac{70}{90}=\dfrac{7}{9};\)\(\dfrac{96}{72}=\dfrac{4}{3}\)\(\dfrac{45}{35}=\dfrac{9}{7}\)

\(\dfrac{6}{10}=\dfrac{3}{5};\dfrac{70}{90}=\dfrac{7}{9};\dfrac{96}{72}=\dfrac{4}{3};\dfrac{45}{35}=\dfrac{9}{7}\)

6/10=3/5

70/90=7/9

96/72=4/3

45/35=9/7 nha

HT

\(\dfrac{{ - 12}}{{ - 4}} = \dfrac{{ - 12:\left( { - 4} \right)}}{{\left( { - 4} \right):\left( { - 4} \right)}} = 3\)

\(\dfrac{7}{{ - 35}} = \dfrac{{7:\left( { - 7} \right)}}{{ - 35:\left( { - 7} \right)}} = \dfrac{{ - 1}}{5}\)

\(\dfrac{{ - 9}}{{27}} = \dfrac{{ - 9:9}}{{27:9}} = \dfrac{{ - 1}}{3}\)