原式=
1
2 (3-1)(3+1)(3 2+1)(3 4+1)(3 8+1)(3 64+1),(4分)
=
1
2 (32-1)(32+1)(34+1)(38+1)(3 64+1),
=
1
2 (3 4-1)(3 4+1)(3 8+1)(3 64+1),
=
1
2 (3 8-1)(3 8+1)(3 64+1),
=
1
2 (3 64-1)(3 64+1),(8分)
=
1
2 (3 128-1).(10分)
原式=
1
2 (3-1)(3+1)(3 2+1)(3 4+1)(3 8+1)(3 64+1),(4分)
=
1
2 (32-1)(32+1)(34+1)(38+1)(3 64+1),
=
1
2 (3 4-1)(3 4+1)(3 8+1)(3 64+1),
=
1
2 (3 8-1)(3 8+1)(3 64+1),
=
1
2 (3 64-1)(3 64+1),(8分)
=
1
2 (3 128-1).(10分)