a)

a)

lấy máy tính ra bấm là nó ra liền à

\(\frac{-35}{280}=\frac{\left(-35\right):35}{280:35}=\frac{-1}{8}\)     

\(\frac{24}{72}=\frac{24:24}{72:24}=\frac{1}{3}\)

\(\frac{15}{-105}=\frac{-15}{105}=\frac{\left(-15\right):15}{105:15}=\frac{-1}{7}\)

\(\frac{36}{240}=\frac{36:12}{240:12}=\frac{3}{20}\)

\(\frac{125}{1000}=\frac{125:125}{1000:125}=\frac{1}{8}\)

\(\frac{198}{126}=\frac{198:18}{126:18}=\frac{11}{7}\)

\(a,\frac{6}{10}=\frac{3}{5};\frac{6}{16}=\frac{3}{8};-\frac{15}{20}=\frac{3}{4};-\frac{10}{30}=\frac{-1}{3}\)

\(b,\frac{42}{28}=\frac{3}{2};\frac{54}{-21}=-\frac{10}{7};-\frac{27}{33}=-\frac{9}{11};\frac{25}{14}=\frac{25}{14}\)

\(c,\frac{125}{1000}=\frac{1}{8};\frac{198}{126}=\frac{11}{7};\frac{3}{243}=\frac{1}{81};\frac{103}{2090}=\frac{103}{2090}\)

\(d,\frac{2.3}{9.14}=\frac{28}{3}\)

máy tính đâu bạn ơi

\(A=2,970871956;B=\frac{102}{103}\)

\(A>2>1>B\)

\(\Rightarrow A>B\)

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Ta có: \(B=\frac{101+102+103}{102+103+104}=\frac{101}{102+103+101}+\frac{102}{102+103+104}+\)\(\frac{103}{102+103+104}\)

Vì: \(\frac{101}{102}>\frac{101}{102+103+104}\)

\(\frac{102}{103}>\frac{102}{102+103+104}\)

\(\frac{103}{104}>\frac{103}{102+103+104}\)

\(\Rightarrow A>B\)

Vậy A > B

A= 101+ 102 +103                                                  B= 101+ 102 +103  

   102 + 103 + 104                                                   102 + 103 + 104  

= 102 phần 104                                                         = 101 phần 104

vậy a = b

A > B nhé bn