Ответ:
а1+а2+а3+а4+а5=25
а1+а1+d+a1+2d+a1+3d+a1+4d=25
5a1+10d=25
5a1+10=25
5a1=15
a1=3
a4=a1+3d
a4=3+3
a4=6
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Ответ:
а1+а2+а3+а4+а5=25
а1+а1+d+a1+2d+a1+3d+a1+4d=25
5a1+10d=25
5a1+10=25
5a1=15
a1=3
a4=a1+3d
a4=3+3
a4=6