遇到小数3循环的,就给它乘以30.53 (3循环) ×3=1.59 (9循环)而1.59 (9循环)就等于1.6=8/5,所以0.53 (3循环) =(8/5) /3=8/150.819 (819的循环) = 819 × 0.001 (001循环)= 819/999 × 0.999(9循环)而0.999(9循环)就等...