Ta có:1-1995/1996=1/1996

1-1996/1997=1/1997

Vì 1/1996>1/1997=>1995/1996<1996/1997

b, 2121/3737=2121/101=21

                       3737/101=37

212121/373737=212121/10101=21

                           373737/10101=37

=>2121/3737=212121/373737

a) \(\dfrac{1995}{1996}\) < \(\dfrac{1996}{1997}\)

b) \(\dfrac{2121}{3737}\) = \(\dfrac{212121}{373737}\)

b : 2121/3737 = 212121/373737 

Vì 2121/3737  rút gọn thành 21/37

212121/373737 rút gọn thành 21/37 luôn

Mình chỉ biết làm câu b thôi

a)\(\frac{1995}{1996};\frac{1996}{1997}\)

Ta thấy:

\(\frac{1995}{1996}=1-\frac{1}{1996}\);\(\frac{1996}{1997}=1-\frac{1}{1997}\).Vì \(\frac{1}{1996}>\frac{1}{1997}\)nên:\(\frac{1995}{1996}>\frac{1996}{1997}\).

b)\(\frac{2121}{3737}=\frac{21\times101}{37\times101}=\frac{21}{37};\frac{212121}{373737}=\frac{21\times10101}{37\times10101}=\frac{21}{37}.\)

Vậy ta có:\(\frac{2121}{3737}=\frac{212121}{373737}.\)

a) 1995/1996 và 1996/1997

 Ta có: 1995/1996=1 - 1/1996        

            1996/1997=1 - 1/1997

Vì 1/1996 > 1/1997 nên 1995/1996 < 1996/1997

b) Ta có: \(\frac{2121}{3737}=\frac{2121:101}{3737:101}=\frac{21}{37}\); \(\frac{212121}{373737}=\frac{212121:10101}{373737:10101}=\frac{21}{37}\)

Vì 21/37=21/37 nên 2121/3737 = 212121/373737

a, Ta có: 1-1995/1996=1/1996  ;  1-1996/1997=1/1997

do 1/1996 > 1/1997 nên 1995/1996 < 1996 1997

ai thấy đúng thì k cho mình nha

2 phân số này đều bằng nhau vì 2 phân số đều có số chung là 19/21

1919/2121=19/21

191919/212121=19/21

Vậy 2 phân số bằng nhau.

Ta có : \(\frac{1919}{2121}=\frac{19}{21}\)

             \(\frac{191919}{212121}=\frac{19}{21}\)

Vì \(\frac{19}{21}=\frac{19}{21}\) \(\Rightarrow\) \(\frac{1919}{2121}=\frac{191919}{212121}\)

k nhá

1.

a,\(\frac{12}{17};\frac{15}{17};\frac{12}{12};\frac{19}{15};\frac{19}{13}\)

b,\(\frac{19}{13};\frac{19}{15};\frac{12}{12};\frac{15}{17};\frac{12}{17}\)

2.

a,\(\frac{1995}{1996}\)và \(?\)                                                      b,\(\frac{2121}{3737}=\frac{212121}{373737}\)

                                                                                      Vì\(\frac{2121:101}{3737:101}=\frac{21}{37}\)và\(\frac{212121:10101}{373737:10101}=\frac{21}{37}\)

b. 19/13,19/15,12/12,15/17,12/17

a thì làm ngược lại

Đáp án của mik là con ngươi

chúc bạn học tốt nhé 

\(\frac{3737}{5353}=\frac{37}{53}\)

\(\frac{373737}{535353}=\frac{37}{53}\)

Vì \(\frac{37}{53}=\frac{37}{53}\)nên \(\frac{3737}{5353}=\frac{373737}{535353}\)

Ta có:

\(\frac{3737}{5353}=\frac{37x101}{53x101}=\frac{37}{53}\)

\(\frac{373737}{535353}=\frac{37x10101}{53x10101}=\frac{37}{53}\)

Vì \(\frac{37}{53}=\frac{37}{53}\)

=> \(\frac{3737}{5353}=\frac{373737}{535353}\)

ỦNG HỘ NHA

3737/5353<373737/535353

\(\dfrac{212121}{232323}=\dfrac{212121:10101}{232323:10101}=\dfrac{21}{23}\)

\(\dfrac{123123}{124124}=\dfrac{123123:1001}{124124:1001}=\dfrac{123}{124}\)

Ta có: \(1-\dfrac{21}{23}=\dfrac{2}{23}\) ; \(1-\dfrac{123}{124}=\dfrac{1}{124}=\dfrac{2}{248}\)

\(=>\dfrac{2}{23}>\dfrac{2}{248}\)

\(=>1-\dfrac{21}{23}>1-\dfrac{123}{124}\)

\(=>\dfrac{21}{23}< \dfrac{123}{124}\)

\(=>\dfrac{212121}{232323}< \dfrac{123123}{124124}\)

a,\(-\frac{15}{21}=-\frac{5}{7};-\frac{55}{77}=-\frac{5}{7}\Rightarrow-\frac{15}{21}=-\frac{55}{77}\)

b, \(-\frac{3737}{5151}=-\frac{37}{51};-\frac{373737}{515151}=-\frac{37}{51}\Rightarrow-\frac{3737}{5151}=-\frac{373737}{515151}\)