a₂=a₁+d
a₄=a₁+3d
a₄-a₂=(a₁+3d)-(a₁+d)=a₁+3d-a₁-d=2d
a₄-a₂=28-4=26
значит 2d=26
d=13
О т в е т. 13
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Verified answer
a₂=a₁+d
a₄=a₁+3d
a₄-a₂=(a₁+3d)-(a₁+d)=a₁+3d-a₁-d=2d
a₄-a₂=28-4=26
значит 2d=26
d=13
О т в е т. 13