(1+1/1*3)(1+1/2*4)(1+1/3*5)……(1+1/9*11)找规律
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(1+1/1*3)(1+1/2*4)(1+1/3*5)……(1+1/9*11)找规律
(1+1/1*3)(1+1/2*4)(1+1/3*5)……(1+1/9*11)找规律
(1+1/1*3)(1+1/2*4)(1+1/3*5)……(1+1/9*11)找规律
(1+1/1*3)(1+1/2*4)(1+1/3*5)……(1+1/9*11)
=(2^2/1*3)*(3^2/2*4)*(4^2/3*5).(10^2/9*11)
=2^2*(3*4*..*9)^2*10^2/(1*2*3^2*4^2*.*7^2*8^2*9^*10*11)
=2^2*10^2/(1*2*10*11)
=2*10/1*11
=20/11
20/11