19.2÷2.4×3.2      12.5×0.32×0.5
14.3÷1.1-1.8        3.2×2.4+32×0.76.

解:(1)19.2÷2.4×3.2,
=8×3.2,
=25.6;

(2)12.5×0.32×0.5,
=12.5×(0.4×0.8)×0.5,
=(12.5×0.8)×(0.4×0.5),
=10×0.2,
=2;

(3)14.3÷1.1-1.8,
=13-1.8,
=11.2;

(4)3.2×2.4+32×0.76,
=3.2×2.4+3.2×7.6,
=3.2×(2.4+7.6),
=3.2×10,
=32.
分析:(1)按照從左向右的順序進(jìn)行計(jì)算;
(2)根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算;
(3)先算除法,再算減法;
(4)根據(jù)乘法分配律進(jìn)行計(jì)算.
點(diǎn)評(píng):此題主要考查小數(shù)的四則混合運(yùn)算的運(yùn)算順序和應(yīng)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.
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