[tex]\displaystyle\bf\\T=2 \ \ \ ; \ \ \ f(0)=1\\\\f(18)=f(18-9T)=f(18-18)=f(0)=1\\\\7f(18)=7\cdot 1=7\\\\Otvet \ : \ 7f(18)=7[/tex]
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[tex]\displaystyle\bf\\T=2 \ \ \ ; \ \ \ f(0)=1\\\\f(18)=f(18-9T)=f(18-18)=f(0)=1\\\\7f(18)=7\cdot 1=7\\\\Otvet \ : \ 7f(18)=7[/tex]