a) Ta có : 2/5 x 25/18 = 5/9 =0,(5)
Vậy 2 > 2/5x 25/18
b) Ta có 9/11 : 2 = 9/11 x 1/2 = 9/22 = 0,40(90)
5/2 x 2 = 5
3/4 = 0 .75
Vậy 5/2 x 2 > 3/4 > 9/11 : 2
a) Ta có:
\(\frac{2}{5}\times\frac{25}{18}=\frac{2\times25}{5\times18}=\frac{50}{90}=\frac{5}{9}=0,5555......\)
\(\Rightarrow2>\frac{2}{5}\times\frac{25}{18}\)
b) Ta có:
\(\frac{9}{11}:2=\frac{9}{11}:\frac{2}{1}=\frac{9}{11}\times\frac{1}{2}=\frac{9\times1}{11\times2}=\frac{9}{22}\)
\(\frac{5}{2\times2}=\frac{5}{4}\)
\(\Rightarrow\frac{9}{22}<\frac{5}{4}>\frac{3}{4}\)