Ответ:
a1=1
a7= a1+6d=25
d=4
a2= a1+d= 1+4= 5
a3= a1+ 2d= 1+8= 9
a4= a1+3d= 1+ 12= 13
a5= a1+4d= 1+ 16= 17
a6= a1+ 5d= 1+20= 21
1, 5, 9, 13, 17, 21, 25
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Ответ:
a1=1
a7= a1+6d=25
d=4
a2= a1+d= 1+4= 5
a3= a1+ 2d= 1+8= 9
a4= a1+3d= 1+ 12= 13
a5= a1+4d= 1+ 16= 17
a6= a1+ 5d= 1+20= 21
1, 5, 9, 13, 17, 21, 25