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[主观题]
The UN Secretary-General, elected by the UN Security Council, serves a term of five years.
A.Y
B.N
C.NG
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A.Y
B.N
C.NG
A.un homme grand
B.un grand homme
C.grand un homme
D.homme un grand
设un(x)(n=1,2,…)是[a,b]上的单调函数,证明:若∑un(a)与∑un(b)都绝对收敛,则∑un(x)在[a,b]上绝对且一致收敛.
若,证明
并举例说明,数列|un|收敛时,数列un未必收敛.