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设g(x)＝则g[g]＝________.
设g(x)＝则g[g()]＝________
设g(x)＝则g(g())＝_________．
设g(x)＝则g[g()]＝________．
则g[g(
)]＝________
则g(g(
))＝_________．
则g[g(
)]＝________．