(1+2/3)乘(1-2/3)乘(1+2/5)乘(1-2/5)乘.乘(1+2/99)乘(1-2/99)
=(1+2/3)乘(1+2/5).乘(1+2/99)乘(1-2/3)乘(1-2/5)乘.乘(1-2/99)
=[(5/3)*(7/5)*.*(101/99)] *[ (1/3)*(3/5)*.(97/99)]
=(101/3)*(1/99)
=101/297
(1+2/3)乘(1-2/3)乘(1+2/5)乘(1-2/5)乘.乘(1+2/99)乘(1-2/99)
=(1+2/3)乘(1+2/5).乘(1+2/99)乘(1-2/3)乘(1-2/5)乘.乘(1-2/99)
=[(5/3)*(7/5)*.*(101/99)] *[ (1/3)*(3/5)*.(97/99)]
=(101/3)*(1/99)
=101/297