分析:(1)運用除法的性質簡算;
(2)運用加法交換律與結合律簡算;
(3)把304看作300+4,278看作300-2,運用加法交換律與結合律簡算;
(4)把8看作4×2,運用乘法交換律與結合律簡算;
(5)(6)先算括號內的,再算括號外的;
(7)把32看作4×8,運用乘法結合律簡算;
(8)把35看作7×5,運用除法的性質簡算.
解答:解:(1)240÷15÷4,
=240÷(15×4),
=240÷60,
=4;
(2)129+318+71,
=(129+71)+318,
=200+318,
=518;
(3)304+278,
=(300+4)+(300-22),
=300+300-(22-4),
=600-18,
=582;
(4)25×(17×8),
=25×8×17,
=(25×4)×(2×17),
=100×34,
=3400;
(5)(614+346)÷48,
=960÷48,
=20;
(6)94×(205-188),
=94×17,
=1598;
(7)25×32×125,
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(8)420÷35,
=420÷(7×5),
=420÷7÷5,
=60÷5,
=12.
點評:此題主要考查整數(shù)的四則混合運算的運算順序和應用運算定律進行簡便計算.