在等差数列{an}中,α₁+α₂=3,α₃+α₄=6,α7+α8=
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![在等差数列{an}中,α₁+α₂=3,α₃+α₄=6,α7+α8=](/uploads/image/z/8668583-71-3.jpg?t=%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2C%CE%B1%26%238321%3B%2B%CE%B1%26%238322%3B%3D3%2C%CE%B1%26%238323%3B%2B%CE%B1%26%238324%3B%3D6%2C%CE%B17%2B%CE%B18%3D)
在等差数列{an}中,α₁+α₂=3,α₃+α₄=6,α7+α8=
在等差数列{an}中,α₁+α₂=3,α₃+α₄=6,α7+α8=
在等差数列{an}中,α₁+α₂=3,α₃+α₄=6,α7+α8=
在等差数列{an}中,α₁+α₂=3,α₃+α₄=6,α7+α8=12,
α7+α8=12
α₃+α₄=6=α₁+2d+α₂+2d=α₁+α₂+4d=3+4d d=4/3
α7+α8=α₁+6d+α₂+6d=α₁+α₂+12d=3+12*4/3=3+16=19