≈(127+1)*73/127+2.6
=73+73/127+2.6
=75.6+73/127
≈75.6+(63.5+9.5)/73
=75.6+0.5+9.5/73
=76.1+9.5/73
≈76.1
如果再细点
76.1+9.5/73
≈76.1+(7.3+2.3)/73
=76.1+0.1+2.3/73
≈76.2到底哪儿个答案是？噢，中间除了点差错，呵呵，但思路是对的=(127+1)*73/127+2.6=73+73/127+2.6=75.6+73/127=75.6+(63.5+9.5)/127=75.6+0.5+9.5/127=76.1+9.5/127≈76.1