请给出下面等式的证明过程或方法(除数学归纳法以外)!
1个回答
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. (n + 1)(n + 2)...(n + n)
. 1·2·...·n·(n+1)·...·(2n-1)(2n)
= ------------------------------------------------
. 1·2·...·(n-1)·n
. (1·3·...·(2n-3)(2n-1)) * (2·4·...·(2n-2)(2n))
= ----------------------------------------------------------------
. 1·2·...·(n-1)·n
. (1·3·...·(2n-3)·(2n-1)) * (2^n ·(1·2·...·(n-1)·n ) )
= -----------------------------------------------------------------------------
. 1·2·...·(n-1)·n
= 1·3·...·(2n-3)·(2n-1) * 2^n .
. 1·2·...·n·(n+1)·...·(2n-1)(2n)
= ------------------------------------------------
. 1·2·...·(n-1)·n
. (1·3·...·(2n-3)(2n-1)) * (2·4·...·(2n-2)(2n))
= ----------------------------------------------------------------
. 1·2·...·(n-1)·n
. (1·3·...·(2n-3)·(2n-1)) * (2^n ·(1·2·...·(n-1)·n ) )
= -----------------------------------------------------------------------------
. 1·2·...·(n-1)·n
= 1·3·...·(2n-3)·(2n-1) * 2^n .
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