导读 x1=1 A1=x1y2=a y2=a=k/2 k=2aA1=1*2a/2 A2=2*2a/3 ...........A1*A2*...*An=1*2a/2 *2*2a/3 *....
x1=1 A1=x1y2=a y2=a=k/2 k=2aA1=1*2a/2 A2=2*2a/3 ...........A1*A2*...*An=1*2a/2 *2*2a/3 *...*n*2a/(n+1) =1*...*n *(2a)^n/(2*...*(n+1)) =(2a)^n/(n+1)。
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