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How will the man send his application?
11个月前
已知数列{an}的前n项和为Sn,且a1=1,Sn=n²an(n∈N*)。 (1)试计算S1,S2,S3,S4,并猜想Sn的表达式; (2) 证明你的猜想,并求出an的表达式。
1年前
1年前
By 16:30, _____________ was almost closing time, nearly all the paintings had been sold.
1年前
Jeans have become one piece of clothing worn by the most people in the world.
1年前