解:(1)301×79
=(300+1)×79,
=300×79+1×79,
=23700+79,
=23779;
(2)25×32×125
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(3)125×88
=125×8×11,
=1000×11,
=11000;
(4)8.59+2.57+3.43+5.47
=8.59+(2.57+3.43)+5.47,
=8.59+6+5.47,
=20.06;
(5)49.62+27.17-19.62
=49.62-19.62+27.17,
=30+27.17,
=57.17;
(6)1546-(546-239)
=1546-546+239,
=1000+239,
=1239.
分析:算式(1)可將301拆分為300+1后根據(jù)乘法分配律進(jìn)行計(jì)算;
算式(2)可將32變?yōu)?×8后根據(jù)乘法結(jié)合律進(jìn)行計(jì)算;
算式(3)可將88變?yōu)?×11后進(jìn)行計(jì)算;
算式(4)可根據(jù)加法結(jié)合律進(jìn)行計(jì)算;
算式(5)可根據(jù)加法交換律進(jìn)行計(jì)算;
算式(6)可根據(jù)一個(gè)數(shù)減兩個(gè)數(shù)的差,等于用這個(gè)數(shù)減去兩個(gè)數(shù)中的被減數(shù)加上減數(shù)的減法性質(zhì)進(jìn)行計(jì)算.
點(diǎn)評(píng):完成本題要認(rèn)真分析式中數(shù)據(jù)特點(diǎn)及內(nèi)在聯(lián)系,然后選擇合適的方法進(jìn)行計(jì)算.