21/29 và 171717/979797
Ta có: 171717/979797=17/97 sấp sỉ 0,2
21/29=sấp sỉ 0,7
=>21/29>171717/979797
Ta có:
\(\frac{171717}{979797}=\frac{17x10101}{97x10101}=\frac{17}{97}\)\(\frac{21}{29}>\frac{17}{19}\)mà \(\frac{17}{19}>\frac{17}{97}\)=>\(\frac{21}{29}>\frac{17}{19}>\frac{171717}{979797}\)=>\(\frac{21}{29}>\frac{171717}{979797}\)