1,a2,a3,4成等差数列,a2-a3=

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1,a2,a3,4成等差数列,a2-a3=
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1,a2,a3,4成等差数列,a2-a3=
1,a2,a3,4成等差数列,a2-a3=

1,a2,a3,4成等差数列,a2-a3=
a1=1,a4=4
a4-a1=3d=4-1=3
所以d=1
那么a2-a3=-d=-1


1,a2,a3,4成等差数列,设公差是d
∴ a3-a2=d
4-1=3d
∴ d=1
即 a3-a2=1
∴ a2-a3=-1

1,a2,a3,4成等差数列,a2-a3=-1