a1=0 an+1=an+(2n-1)求a2.a3a1=3 an+1=3an-2 求a2.a3我的an+1里面的n+1是下标你没打错吗?没的话就说下
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![a1=0 an+1=an+(2n-1)求a2.a3a1=3 an+1=3an-2 求a2.a3我的an+1里面的n+1是下标你没打错吗?没的话就说下](/uploads/image/z/2818809-9-9.jpg?t=a1%3D0+an%2B1%3Dan%2B%282n-1%29%E6%B1%82a2.a3a1%3D3+an%2B1%3D3an-2+%E6%B1%82a2.a3%E6%88%91%E7%9A%84an%2B1%E9%87%8C%E9%9D%A2%E7%9A%84n%2B1%E6%98%AF%E4%B8%8B%E6%A0%87%E4%BD%A0%E6%B2%A1%E6%89%93%E9%94%99%E5%90%97%3F%E6%B2%A1%E7%9A%84%E8%AF%9D%E5%B0%B1%E8%AF%B4%E4%B8%8B)
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a1=0 an+1=an+(2n-1)求a2.a3a1=3 an+1=3an-2 求a2.a3我的an+1里面的n+1是下标你没打错吗?没的话就说下
a1=0 an+1=an+(2n-1)求a2.a3
a1=3 an+1=3an-2 求a2.a3
我的an+1里面的n+1是下标
你没打错吗?没的话就说下
a1=0 an+1=an+(2n-1)求a2.a3a1=3 an+1=3an-2 求a2.a3我的an+1里面的n+1是下标你没打错吗?没的话就说下
(1)我把下角标放入以免混淆
a1 = 0
a2 = a1 + 2*1 - 1
a3 = a2 + 2*2 - 1
a4 = a3 + 2*3 - 1
……
a = a + 2*(n-2) - 1
a = a
a2=1 a3=4
7 19
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