(1+2⼀3)x(1-2⼀3)x(1+2⼀5)x(1-2⼀5)x...x(1+2⼀99)x(1-2⼀99)=?

2025-03-23 18:57:32
推荐回答(1个)
回答1:

(1+2/3)x(1-2/3)x(1+2/5)x(1-2/5)x...x(1+2/99)x(1-2/99)
=(1-2/3)x(1+2/3)x(1-2/5)x(1+2/5)x(1-2/7)x(1+2/7)...x(1-2/97)x(1+2/97)x(1-2/99)x(1+2/99)
=1/3 x 5/3 x 3/5 x 7/5 x 5/7 x 9/7 ... x 95/97 x 99/97 x 97/99 x 101/99
= 1/3 x 1 x 1 x 1 ... x 1 x 101/99
=1/3 x 101/99
= 101/297