2.5×0.5×0.125×64
=2.5×0.5×0.125×8×8
=2.5×(0.5×8)×(0.125×8)
=2.5×4×1
=2.5
＝5/2×1/2×1/8×65＝325/32
5/2×1/2×1/8×65＝5/32×65＝325/32
