分析:(1)67÷2.5÷0.4,根據(jù)除法的運算性質進行簡算;
(2)27.5-13.58-6.42,根據(jù)減法的性質進行簡算;
(3)9.88÷[5×(7.34-4.96)],根據(jù)小數(shù)四則混合運算的順序,按照小數(shù)四則運算的計算法則,直接進行計算;
(4)15.4×5.8+5.8×4.6,應用乘法分配律進行簡算;
(5)4.2+14.8×(4-3.99),根據(jù)小數(shù)四則混合運算的順序,按照小數(shù)四則運算的計算法則,直接進行計算;
(6)15+(1.2+3.64×0.5),根據(jù)小數(shù)四則混合運算的順序,按照小數(shù)四則運算的計算法則,直接進行計算;
解答:解:(1)67÷2.5÷0.4,
=67÷(2.5×0.4),
=67÷1,
=67;
(2)27.5-13.58-6.42,
=27.5-(13.58+6.42),
=27.5-20,
=7.5;
(3)9.88÷[5×(7.34-4.96)],
=9.88÷[5×2.38],
=9.88÷11.9,
=9
÷11
,
=
×
,
=
;
(4)15.4×5.8+5.8×4.6,
=(15.4+4.6)×5.8,
=20×5.8,
=116;
(5)4.2+14.8×(4-3.99),
=4.2+14.8×0.01,
=4.2+0.148,
=4.348;
(6)15+(1.2+3.64×0.5),
=15+(1.2+1.82),
=15+3.02,
=18.02.
點評:此題主要考查小數(shù)四則混合運算的計算,注意分析式中數(shù)據(jù),運用合適的簡便方法計算.