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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,然后运用乘法结合律简算.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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