原式=(1+1)*2+(5+3)*2+(13+21)*2+(55+89)*2+(233+377)*2+(987+1597)*2+(4181+6575) =2*2+8*2+34*2+144*2+610*2+2584*2+10756 =(2+8+34+144+610+2584)*2+10756 =3382*2+10756 =6764+10756 =17520
