解:(1)72×125,
=9×8×125,
=9×(8×125),
=9×1000,
=9000;
(2)99×38+38,
=(99+1)×38,
=100×38,
=3800;
(3)3200÷4÷25,
=3200÷(4×25),
=3200÷100,
=32;
(4)9.14-1.43-4.57,
=9.14-(1.43+4.57),
=9.14-6,
=3.14;
(5)1.88+2.3+3.7,
=1.88+(2.3+3.7),
=1.88+6,
=7.88;
(6)98×47,
=(100-2)×47,
=100×47-2×47,
=4700-94,
=4606.
分析:(1)把72看作9×8,運(yùn)用乘法結(jié)合律簡算;
(2)把38看作38×1,運(yùn)用乘法分配律簡算;
(3)運(yùn)用除法的性質(zhì)簡算;
(4)運(yùn)用減法的性質(zhì)簡算;
(5)運(yùn)用加法結(jié)合律簡算;
(6)把98看作100-2,運(yùn)用乘法分配律簡算.
點(diǎn)評:此題是考查四則混合運(yùn)算,要仔細(xì)觀察算式的特點(diǎn),靈活運(yùn)用一些定律進(jìn)行簡便計(jì)算.