Question

(1-1/2的2次方)(1-1/3的2次方).(1-n的2次方)是多少啊啊啊啊啊,急

Answer 1

(1-1/2的2次方)(1-1/3的2次方).(1-n的2次方)

=(1-1/2)(X+1/2)(1-1/3)(1+1/3)...(1-1/N)(1+1/n)

=1/2x3/2x2/3x3/4x...x(n-1)/n (n+1)/n

=1/2x(n+1)/n

=(n+1)/2n