[tex]\displaystyle\bf\\a_{1} =-1,4\\\\d=1,6\\\\\\a_{5}=a_{1} +4d=-1,4+4\cdot 1,6=-1,4+6,4=5\\\\\\Otvet:a_{5} =5[/tex]
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[tex]\displaystyle\bf\\a_{1} =-1,4\\\\d=1,6\\\\\\a_{5}=a_{1} +4d=-1,4+4\cdot 1,6=-1,4+6,4=5\\\\\\Otvet:a_{5} =5[/tex]