1.25×32×0.25    
(2512+5066÷17)×554
數(shù)學(xué)公式              
數(shù)學(xué)公式

解:(1)1.25×32×0.25,
=1.25×8×4×0.25,
=(1.25×8)×(4×0.25),
=10×1,
=10;

(2)(2512+5066÷17)×554,
=(2512+298)×554,
=2810×554,
=1556740;

(3)(2-0.5)÷[(1.2+1.55)×],
=÷[2.75×],
=÷,
=1;

(4)+(,
=+
=+,
=
分析:(1)根據(jù)乘法結(jié)合律和交換律進(jìn)行計(jì)算,
(2)(3)(4)根據(jù)四則運(yùn)算的計(jì)算順序進(jìn)行計(jì)算,
點(diǎn)評:本題綜合考查了學(xué)生在四則運(yùn)算中靈活運(yùn)用簡便算法的能力,注意計(jì)算結(jié)果的準(zhǔn)確性.
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