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A
1
[1,3,7,null,2,3]
2
=A1(3)
3
=A1.m(-2)
4
=A1.m@r(9)
5
=A1.pos(3)
6
=A1.pos@a(3)
7
=A1.pos(4)
A2~A7中运算结果如下: