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[tex]A=9+\frac{-1}{10}\times\frac{7}{5}\\ \\ A=9+\frac{-1\times7}{10\times5} \\ \\A=\frac{9\times50}{50}+\frac{-7}{50} \\ \\A=\frac{450-7}{50}\\ \\ A=\frac{443}{50}[/tex]

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[tex]B=\frac{-12}{11}-\frac{20}{99}:\frac{20}{33}\\ \\B=\frac{-12}{11}-\frac{20}{99}\times\frac{33}{20}\\ \\B=\frac{-12}{11}-\frac{20\times33}{99\times20}\\ \\B=\frac{-12}{11}-\frac{33}{99}\\ \\B=\frac{-12\times9}{11\times9}-\frac{33}{99}\\ \\B=\frac{-108}{99}-\frac{33}{99}\\ \\B=\frac{-141}{99}=\frac{-47\times3}{33\times3}=\frac{-47}{33}[/tex]

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[tex]C=\frac{\frac{7}{2} +10}{\frac{4}{3}+6}\\\\C=\frac{\frac{7}{2} +\frac{20}{2} }{\frac{4}{3}+\frac{18}{3} }\\\\ C=\frac{\frac{27}{2}}{\frac{22}{3}}\\\\C=\frac{27}{2}\times\frac{3}{22} \\\\C=\frac{27\times3}{2\times22} \\ \\ C=\frac{81}{44}[/tex]