(2*4*6*8*.*2n)/(1*3*5*7*9*.*)=?如题
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(2*4*6*8*.*2n)/(1*3*5*7*9*.*)=?如题(2*4*6*8*.*2n)/(1*3*5*7*9*.*)=?如题(2*4*6*8*.*2n)/(1*3*5*7*9*.*)=?如题(
(2*4*6*8*.*2n)/(1*3*5*7*9*.*)=?如题
(2*4*6*8*.*2n)/(1*3*5*7*9*.*)=?
如题
(2*4*6*8*.*2n)/(1*3*5*7*9*.*)=?如题
(2*4*6*8*.*2n)/(1*3*5*7*9*.*(2n-1))
= 2(1*2*3*…… *n)* 2(1*2*3*…… *n)/ (1*3*5*7*9*.*(2n-1)) 2(1*2*3*…… *n)
= 4 n!* n!/ (2n)!