第1个回答 推荐于2020-12-09
1/2 1/4 3/8 15/16 105/32 945/64 10395/128 135135/2561 / 2=1/21x1 / 2x2=1/41x3 / 2x2x2=3/81x3x5 / 2x2x2x2=15/161x3x5x7 / 2x2x2x2x2=105/321x3x5x7x9 / 2x2x2x2x2x2=945/641x3x5x7x9x11 / 2x2x2x2x2x2x2=10395/1281x3x5x7x9x11x13 / 2x2x2x2x2x2x2x2=135135/256