分析:(1)運用乘法交換律簡算;
(2)運用乘法分配律簡算;
(3)先根據(jù)乘法的意義,把加法變成乘法,再運用乘法結(jié)合律簡算;
(4)先算小括號里面的減法,再算中括號里面的乘法,最后算括號外的除法;
(5)先算小括號里面的除法,再算小括號里面的減法,然后算括號外的除法,最后算加法;
(6)先算小括號里面的減法,再算括號外的乘法,最后算減法.
解答:解:(1)125×9.3×0.08,
=125×0.08×9.3,
=10×9.3,
=93;
(2)13.7×102-2×13.7,
=13.7×(102-2),
=13.7×100,
=1370;
(3)(6.7+6.7+6.7+6.7)×2.5,
=6.7×4×2.5,
=6.7×(4×2.5),
=6.7×10,
=67;
(4)4.5÷[(27.8-25.3)×0.4],
=4.5÷[2.5×0.4],
=4.5÷1,
=4.5;
(5)0.096÷0.01+(75-28÷112),
=0.096÷0.01+(75-0.25),
=0.096÷0.01+74.75,
=9.6+74.75,
=84.35;
(6)90.8-(7.03-2.17)×4.5,
=90.8-4.86×4.5,
=90.8-21.87,
=68.93.
點評:此題主要考查小數(shù)的四則混合運算的運算順序,以及應(yīng)用運算定律進行簡便計算的能力.