巧算：0.747*0.25+0.53*0.025-2.5*0.04急急急
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解：0.747*0.25+0.53*0.025-2.5*0.04
=0.747*0.25+0.053*0.25-0.25*0.4
=（0.747+0.053-0.4）*0.25
=0.1
=0.747*0.25+0.053*0.25-0.25*0.4
=（0.747+0.053-0.4）*0.25
=0.1
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0.747*0.25+0.53*0.025-2.5*0.04
=0.747*0.25+0.053*0.25-0.25*0.4
=0.25*（0.747+0.053-0.4）
=0.25*0.4
=0.1
=0.747*0.25+0.053*0.25-0.25*0.4
=0.25*（0.747+0.053-0.4）
=0.25*0.4
=0.1
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0.747*0.25+0.53*0.025-2.5*0.04
=0.747×0.25+0.053×0.25-0.25×0.4
=0.25×（0.747+0.053-0.4）
=0.25×0.4
=1/4×0.4
=0.1
=0.747×0.25+0.053×0.25-0.25×0.4
=0.25×（0.747+0.053-0.4）
=0.25×0.4
=1/4×0.4
=0.1
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