1.25×2.5×0.64×0.5．1.25×2.5×0.64×0.5，
=1.25×2.5×0.8×0.4×2×0.5，
=（1.25×0.8）×（2.5×0.4）×（2×0.5），
=1×1×1，
=1．
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