\(\frac{3131}{3535}=\frac{3131:101}{3535:101}=\frac{31}{35}\)
\(\frac{204204}{217217}=\frac{204204:1001}{217217:1001}=\frac{204}{217}\)
\(\frac{414141}{180180}=\frac{414141:273}{180180:273}=\frac{1517}{660}\)
\(\frac{171171171}{180180180}=\frac{171171171:9009009}{180180180:9009009}=\frac{19}{20}\)
\(\frac{3131}{3535}=\frac{31.101}{35.101}=\frac{31}{35}.\)
\(\frac{204204}{217217}=\frac{204.1001}{217.1001}=\frac{204}{217}.\)
\(\frac{414141}{494949}=\frac{41.10101}{49.10101}=\frac{41}{49}.\)
\(\frac{171171171}{180180180}=\frac{171.1001001}{180.1001001}=\frac{171}{180}.\)
...................hình như cả hai đều ..........................sai-^-