分析:(1)運(yùn)用加法交換律與結(jié)合律簡(jiǎn)算;
(2)運(yùn)用除法的性質(zhì)簡(jiǎn)算;
(3)把32看作8×4,運(yùn)用乘法交換律與結(jié)合律簡(jiǎn)算;
(4)(6)從左往右依次運(yùn)算;
(5)先算乘除,再算加法.
解答:解:(1)1.28+0.86+38.72,
=(1.28+38.72)+0.86,
=40+0.86,
=40.86;
(2)0.45÷0.6÷0.5,
=0.45÷(0.6×0.5),
=0.45÷0.3,
=1.5;
(3)32×0.25×1.25,
=8×4×0.25×1.25,
=(4×0.25)×(1.25×8),
=1×10,
=10;
(4)0.78÷0.13×0.2,
=6×0.2,
=1.2;
(5)13.6×9+40.6÷2,
=122.4+20.3,
=142.7;
(6)1.08×0.8÷0.27,
=0.864÷0.27,
=3.2.
點(diǎn)評(píng):此題考查了小數(shù)的四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.