[tex]\displaystyle\bf\\1)\\\\d=0,5\\\\a_{9} =3\\\\a_{1} =?\\\\\\a_{9} =a_{1} +8d\\\\a_{1} =a_{9} -8d=3-8\cdot 0,5=3-4=-1\\\\Otvet \ : \ a_{1} =-1\\\\\\2)\\\\d=0,2\\\\a_{9} =-2\\\\a_{1} =?\\\\\\a_{9} =a_{1} +8d\\\\a_{1} =a_{9} -8d=-2-8\cdot 0,2=-2-1,6=-3,6\\\\Otvet \ : \ a_{1} =-3,6[/tex]
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[tex]\displaystyle\bf\\1)\\\\d=0,5\\\\a_{9} =3\\\\a_{1} =?\\\\\\a_{9} =a_{1} +8d\\\\a_{1} =a_{9} -8d=3-8\cdot 0,5=3-4=-1\\\\Otvet \ : \ a_{1} =-1\\\\\\2)\\\\d=0,2\\\\a_{9} =-2\\\\a_{1} =?\\\\\\a_{9} =a_{1} +8d\\\\a_{1} =a_{9} -8d=-2-8\cdot 0,2=-2-1,6=-3,6\\\\Otvet \ : \ a_{1} =-3,6[/tex]