分析:(1)運用除法的性質(zhì)簡算;
(2)運用加法交換律與結(jié)合律簡算;
(3)運用乘法分配律簡算;
(4)先算小括號內(nèi)的,再算中括號內(nèi)的,最后算括號外的;
(5)運用乘法分配律簡算;
(6)括號內(nèi)變?yōu)?.17×4,然后運用乘法結(jié)合律簡算.
解答:解:(1)13.8÷(1.38×0.02)
=13.8÷1.38÷0.02
=10÷0.02
=500;
(2)3.9+0.56+6.1+0.44
=(3.9+6.1)+(0.56+0.44)
=10+1
=11;
(3)3.74×9.6+0.4×3.74
=3.74×(9.6+0.4)
=3.74×10
=37.4;
(4)4.75×[60÷(3.24-3.04)]
=4.75×[60÷0.2]
=4.75×300
=1425;
(5)1.25×(8+0.4)×25
=1.25×8×25+1.25×0.4×25
=10×25+1.25×(0.4×25)
=250+1.25×10
=250+12.5
=262.5;
(6)(9.17+9.17+9.17+9.17)×2.5
=(9.17×4)×2.5
=9.17×(4×2.5)
=9.17×10
=91.7.
點評:完成本題要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.