设m,n∈Z+,证明:当x→0时, (1)o(xm)+o(xn)=o(xl),l=min{m,n}; (2)o(xm)×o(xn)=o(xm+n); (3)若α是x→0时的无穷小,则αxm=o(xm); (4)o(kxn)=o(xn(k≠0).

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问题 设m,n∈Z,证明:当x→0时,
(1)o(xm)+o(xn)=o(xl),l=min{m,n};
(2)o(xm)×o(xn)=o(xm+n);
(3)若α是x→0时的无穷小,则αxm=o(xm);
(4)o(kxn)=o(xn(k≠0).

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