43/47>19/35

43/49<31/35

\(\frac{29}{35}\)<\(\frac{43}{49}\)<\(\frac{31}{35}\)<\(\frac{43}{47}\)

43/47=43x35/47x35=1505/1645

                                                  => 1505/1645>1363/1645 <=> 43/47>29/35

29/35=29x47/35x47=1363/1645

43/49=43x35/49x35=1505/1715

                                                   => 1505/1715<1519/1715 <=> 43/49<31/35

31/35=31x49/35x49=1519/1715

\(\frac{15}{25}=\frac{3\cdot5}{5\cdot5}=\frac{3}{5}=\frac{21}{35}< \frac{25}{35}=\frac{5\cdot5}{5\cdot7}=\frac{5}{7}\)

\(\frac{17}{49}< \frac{17}{48}< \frac{18}{48}=\frac{3\cdot6}{6\cdot8}=\frac{3}{8}\)

\(\frac{13}{60}< \frac{13}{50}=\frac{26}{100}< \frac{27}{100}\)

\(\frac{43}{47}>\frac{42}{47}>\frac{42}{49}=\frac{6\cdot7}{7\cdot7}=\frac{6}{7}=\frac{30}{35}>\frac{29}{35}\)

\(\frac{1993}{1995}< \frac{1994}{1996}=\frac{997}{998}\)

Đáp án là 24

muốn so sánh thì ta quy đồng mẫu số lên rồi so sánh

a) 49-6/ 49=1-6/49

35-4/ 35=1-4/35

Mà 6/49>4/35

=> 1-6/49<1-4/35

=>43/49<31/35

các câu sau lm tương tự

b) > 

c) <

a) 49-6/ 49=1-6/49

35-4/ 35=1-4/35

Mà 6/49>4/35

=>1-6/49<1-4/35

=>43/49<31/35

các câu sau lm tương tự

b) >

c) <