不好意思,看到晚了,但求助了还是给你解答一下哈
原式
=(1-1/2)x(1+1/2)x(1-1/3)x(1+1/3)x(1-1/4)x(1+1/4)x……x(1-1/99)x(1+1/99)
=1/2x3/2x2/3x4/3x3/4x4/5x5/4x……x98/99x100/99
=1/2x(3/2x2/3)x(4/3x3/4)x(4/5x5/4)x……x98/99x100/99
=1/2x100/99
=50/99 (99分之50)
不好意思,看到晚了,但求助了还是给你解答一下哈
原式
=(1-1/2)x(1+1/2)x(1-1/3)x(1+1/3)x(1-1/4)x(1+1/4)x……x(1-1/99)x(1+1/99)
=1/2x3/2x2/3x4/3x3/4x4/5x5/4x……x98/99x100/99
=1/2x(3/2x2/3)x(4/3x3/4)x(4/5x5/4)x……x98/99x100/99
=1/2x100/99
=50/99 (99分之50)