分析:(1)1.25×3.2×0.8,運(yùn)用乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(2)14.5×102,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(3)4.38÷0.125÷0.8,根據(jù)除法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
(4)6.4×4.5+3.6×4.5.運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算.
解答:解:(1)1.25×3.2×0.8,
=3.2×(1.25×0.8),
=3.2×1,
=3.2;
(2)14.5×102,
=14.5×100+14.5×2,
=1450+29,
=1479;
(3)4.38÷0.125÷0.8,
=4.38÷(0.125×0.8),
=4.38÷0.1,
=43.8;
(4)6.4×4.5+3.6×4.5.
=(6.4+3.6)×4.5,
=10×4.5,
=45.
點(diǎn)評(píng):此題考查的目的是使學(xué)生理解掌握乘法的運(yùn)算定律和除法的運(yùn)算性質(zhì),并且能夠靈活運(yùn)用這些運(yùn)算定律和運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)便計(jì)算.