[tex]\displaystyle\bf\\a_{6} =45\\\\a_{8} =53\\\\a_{7} = \ ?\\\\\\a_{7} =\frac{a_{6}+a_{8} }{2} =\frac{45+53}{2}=\frac{98}{2} =49\\\\\\Otvet \ : \ a_{7}=49[/tex]
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[tex]\displaystyle\bf\\a_{6} =45\\\\a_{8} =53\\\\a_{7} = \ ?\\\\\\a_{7} =\frac{a_{6}+a_{8} }{2} =\frac{45+53}{2}=\frac{98}{2} =49\\\\\\Otvet \ : \ a_{7}=49[/tex]