1/2+3/2∧+5/2∧3+……+2n-1/2∧n等于多少?
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1/2+3/2∧+5/2∧3+……+2n-1/2∧n等于多少?
1/2+3/2∧+5/2∧3+……+2n-1/2∧n等于多少?
1/2+3/2∧+5/2∧3+……+2n-1/2∧n等于多少?
将此式乘2,得1+3/2+5/2^2+…
错位相减得 1+(3/2-1/2)+(5/4-3/4)+…
即 1+1+1/2+1/4+1/8+…=3
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