0.5＋0.25＋0.125＋0.0625+0.03125=32×（0.5＋0.25＋0.125＋0.0625+0.03125）÷32=（16+8+4+2+1）÷32=31/32求采纳
0.25=1/4125*4*250=125*1000=125000
