1.25×2.5×0.64×0.5.

解: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.
分析:先把0.64分解成0.8×0.4×2,然后運用乘法結(jié)合律簡算.
點評:完成本題要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.
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