\(\dfrac{153153}{174174}=\dfrac{153153:3003}{174174:3003}=\dfrac{51}{58}\)

\(\dfrac{19}{57}=\dfrac{19:19}{57:19}=\dfrac{1}{33}\)

\(\dfrac{36}{72}=\dfrac{36:36}{72:36}=\dfrac{1}{2}\)

\(\dfrac{202020}{303030}=\dfrac{202020:101010}{303030:101010}=\dfrac{2}{3}\)

\(\frac{121212}{424242}=\frac{121212:10101}{424242:10101}=\frac{12}{42}=\frac{2}{7}\)

\(\frac{1999999999}{9999999995}=\frac{1999999999:1999999999}{9999999995:1999999999}=\frac{1}{5}\)

121212 / 424242 = 2/7

1999999999 / 9999999995 = 1/5

\(\frac{121212}{424242}\)

= \(\frac{12.10101}{42.10101}\)

rút gọn

= \(1\)

\(\frac{121212}{424242}=\frac{121212:60606}{424242:60606}=\frac{2}{7}\)

ta có \(\frac{121212}{424242}=\frac{121212:60606}{424242:60606}=\frac{2}{7}\)

121212/424242=2/7 vì đề chia cho 60606

\(\frac{323232}{424242}=\frac{32\cdot10101}{42\cdot10101}=\frac{32}{42}=\frac{16}{21}\)

16/21 nha!

lấy máy tính , tính sẽ ra

1313/1717 = 13/17

102102/109109 = 102/109

424242/535353 = 42/53

103103103/109109109 = 103/109

\(\frac{121212}{424242}\text{ để ý:}\overline{ababab}=ab.10101\Rightarrow ps=\frac{12.10101}{42.10101}=\frac{12}{42}=\frac{2}{7}\)

chịu thua luôn 

3/8+5/8=1

=\(\dfrac{3}{8}\)+\(\dfrac{3}{4}\)=\(\dfrac{3}{8}\)+\(\dfrac{6}{8}\)=\(\dfrac{9}{8}\)