`MSC : 120`
`9/8 = 135/120`
`5/6 = 100/120`
`3/4 = 90/120`
`6/5 = 144/120`
`1/2 = 60/120`
`60 < 90 < 100 < 135 < 144 ` hay `1/2 < 3/4 < 5/6 < 9/8 < 6/5`
`=> 1/2 ; 3/4 ; 5/6 ; 9/8 ; 6/5`
\(MSC:120\)
\(\dfrac{9}{8}=\dfrac{9.15}{8.15}=\dfrac{135}{120}\)
\(\dfrac{5}{6}=\dfrac{5.20}{6.20}=\dfrac{100}{120}\)
\(\dfrac{3}{4}=\dfrac{3.30}{4.30}=\dfrac{90}{120}\)
\(\dfrac{6}{5}=\dfrac{6.24}{5.24}=\dfrac{144}{120}\)
\(\dfrac{1}{2}=\dfrac{1.60}{2.60}=\dfrac{60}{120}\)
Đây là những phân số có cũng mẫu số nên ta chỉ cần so sánh tử số
Mà:\(144>135>100>90>60\)
Vậy:\(\dfrac{6}{5};\dfrac{9}{8};\dfrac{5}{6};\dfrac{3}{4};\dfrac{1}{2}\)
Mẫu số chung của các phân số là:120
\(\dfrac{9}{8}=\dfrac{9\times15}{8\times15}=\dfrac{135}{120}\)
\(\dfrac{5}{6}=\dfrac{5\times20}{6\times20}=\dfrac{100}{120}\)
\(\dfrac{3}{4}=\dfrac{3\times30}{4\times30}=\dfrac{90}{120}\)
\(\dfrac{6}{5}=\dfrac{6\times24}{5\times24}=\dfrac{144}{120}\)
\(\dfrac{1}{2}=\dfrac{1\times60}{2\times60}=\dfrac{60}{120}\)
Vì 60<90<100<135<144
\(\Rightarrow\dfrac{1}{2}< \dfrac{3}{4}< \dfrac{5}{6}< \dfrac{9}{8}< \dfrac{6}{5}\)
\(\Rightarrow\dfrac{1}{2};\dfrac{3}{4};\dfrac{5}{6};\dfrac{9}{8};\dfrac{6}{5}\)