1⑴数列-教师电子信箱.PDF
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1. a a x
n n 2
n
n 1
a a 1 3n 2 x
n n
a a 1a 1n M3 a a a x
n 1 2 n n 1 n 2
1 1 1 1 1 1
x 1 x
4 9 16 25 36 49
14710131619 x
112358132 1x
2. a 83n x
n
a a 3a 18x
n 3 6
x a 8 n 13 113n x
n
ad x
a 2d 3
a 3a 18 a 7d 5 x75 x
3 6
a 5d 18
3. a 23n x
n
5
a a a 10a a x
n 1 3 4 6
4
n 1
x a 2 3 x
n
ar x
a ar2 101
5
a a 10a a 5
1 3 4 6 3 5
4 ar ar 2
4
2 3 1 1
r r
1 8 2
1
1a 88 x
2
4.
5
an n xan an 1 x
an x
x 5 3 4 4 4 4 19 x
an an 1 4n M2 x
a1 3
an
a a 4n M2 x
n n 1
1 31
5. n
n n 1n 2
12 2 3 3 4 n n 1=
3
x
11112
v n 1 12 x
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