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    2.5×0.6×0.4=1.25×O.7×O.8=
    0.1×0.2×0.3=5.4-0.4×5=
    0.26×O.2×50=0.5×0.75×4=
    12.5×0.1×0.8=0.4×0.1×0.25=

    解：

    2.5×0.6×0.4=0.6；1.25×O.7×O.8=0.7；
    0.1×0.2×0.3=0.006；5.4-0.4×5=3.4；
    0.26×O.2×50=2.6；0.5×0.75×4=1.5；
    12.5×0.1×0.8=1；0.4×0.1×0.25=0.01．

    分析：根据小数四则混合运算的顺序，按照小数乘法的计算法则进行口算，能用简便方法的用简便方法计算．
    点评：此题考查的目的是掌握小数四则混合运算的顺序，并且能够灵活运用乘法的结合律、结合律对小数连乘进行简便计算．
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