Exercice 1)
[tex]A=- \frac{5}{3}+ \frac{-4}{49}* \frac{35}{12} \\ \\
A= - \frac{5}{3}+ \frac{-140}{588} \\ \\
A= - \frac{5}{3}- \frac{5}{21} \\ \\
A=- \frac{35}{21}- \frac{5}{21} \\ \\
A = - \frac{40}{21} [/tex]
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[tex]B=( \frac{1}{4}- \frac{1}{5})( 7+\frac{37}{9}) \\ \\
B= ( \frac{5}{20}- \frac{4}{20})( \frac{63}{9}+ \frac{37}{9}) \\ \\
B= \frac{1}{20}* \frac{100}{9} \\ \\
B = \frac{5}{9} [/tex]
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[tex]C = \frac{ \frac{1}{3}- \frac{2}{5}* \frac{15}{8}+ \frac{7}{12}}{ \frac{1}{5}- \frac{7}{12} } \\ \\
C= \frac{ \frac{1}{3}- \frac{30}{40}+ \frac{7}{12}}{ \frac{2}{10}- \frac{35}{10} } \\ \\
C= \frac{ \frac{1}{3}- \frac{3}{4}+ \frac{7}{12} }{ -\frac{33}{10} } \\ \\
C= \frac{ \frac{4}{12}- \frac{8}{12}+ \frac{7}{12} }{ -\frac{33}{10} } \\ \\
C = \frac{ \frac{2}{12} }{- \frac{33}{10} } \\ \\
C= \frac{1}{6}* -\frac{10}{33} \\ \\
C = - \frac{10}{198} \\ \\
C = - \frac{5}{99} [/tex]
