分析:(1)此題不適宜用乘法分配律簡(jiǎn)算,應(yīng)先算乘法,再算加法;
(2)運(yùn)用乘法交換律與結(jié)合律簡(jiǎn)算;
(3)把201看作200+1,運(yùn)用乘法分配律簡(jiǎn)算;
(4)先算除法,再算減法;
(5)把3.2看作4×0.8,運(yùn)用乘法交換律與結(jié)合律簡(jiǎn)算;
(6)先算除法,再算加法.
解答:解:(1)88×4.9+5.1×0.88
=431.2+4.488
=435.688;
(2)2.5×8×0.4×0.125
=(2.5×0.4)×(8×0.125)
=1×1
=1;
(3)0.65×201
=0.65×(200+1)
=0.65×200+0.65
=130+0.65
=130.65;
(4)36÷0.8-12.9
=45-12.9
=32.1;
(5)0.25×1.25×3.2
=0.25×1.25×4×0.8
=(0.25×4)×(1.25×0.8)
=1×1
=1;
(6)7.28+3.2÷2.5
=7.28+1.28
=8.56.
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)算定律簡(jiǎn)便計(jì)算.