12/12 5/9 5/17 9/8 13/18

\(\dfrac{3}{5}=\dfrac{36}{60};\dfrac{3}{4}=\dfrac{45}{60};\dfrac{7}{12}=\dfrac{35}{60}\\ \dfrac{35}{60}< \dfrac{36}{60}< \dfrac{45}{60}\Rightarrow\dfrac{7}{12}< \dfrac{3}{5}< \dfrac{3}{4}\)

Sắp xếp theo thứ tự từ bé đến lớn 

9/5;1/6;15/7

sắp xếp các PS theo thứ tự tăng dần 35/71,85/13,35/73,79/13,29/13

\(\dfrac{12}{11};\dfrac{6}{5};\dfrac{5}{4};\dfrac{4}{3};\dfrac{3}{2}\)

\(\dfrac{1}{2}=\dfrac{1\cdot24}{2\cdot24}=\dfrac{24}{48}\)

\(\dfrac{3}{48}=\dfrac{3\cdot1}{48\cdot1}=\dfrac{3}{48}\)

\(\dfrac{8}{12}=\dfrac{8\cdot4}{12\cdot4}=\dfrac{32}{48}\)

\(\dfrac{5}{6}=\dfrac{5\cdot8}{6\cdot8}=\dfrac{40}{48}\)

\(\dfrac{7}{12}=\dfrac{7\cdot4}{12\cdot4}=\dfrac{28}{48}\)

mà 3<24<28<32<40

nên \(\dfrac{3}{48}< \dfrac{1}{2}< \dfrac{7}{12}< \dfrac{8}{12}< \dfrac{5}{6}\)

3/48,1/2;7/12;8/12;5/6

3/48, 1/2, 7/12, 8/12, 5/6
hk tốt

9/12;7/12;4/8;-5/6

\(=>\dfrac{1}{6}< \dfrac{2}{3}< \dfrac{5}{5}< \dfrac{5}{4}< \dfrac{19}{12}\)

a,\(\dfrac{1}{6},\dfrac{2}{3},\dfrac{5}{5},\dfrac{5}{4},\dfrac{19}{12}\)

b,\(\dfrac{8}{11}\)\(x=\dfrac{1}{5}\)

\(x=\dfrac{1}{5}:\dfrac{8}{11}\)

\(x=\dfrac{11}{40}\)

\(\dfrac{8}{11}xX=\dfrac{1}{5}=>X=\dfrac{1}{5}:\dfrac{8}{11}=>X=\dfrac{11}{40}\)

3/5=36/60;3/4=45/60;7/12=35/60

35/60<36/60<45/60 nên 7/12<3/5<3/4