下列各组函数中,f(x)与g(x)是同一函数的是 ▲ (填序号).
①f(x) = x-1, g(x)=-1; ②f(x) =
, g(x) = (
)4; ③f(x) =
,g(x) =
.
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下列各组函数中,f(x)与g(x)是同一函数的是 ▲ (填序号).
①f(x) = x-1, g(x)=-1; ②f(x) =
, g(x) = (
)4; ③f(x) =
,g(x) =
.
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