用簡(jiǎn)便方法計(jì)算.12%    
301×79         
125×72×4        
728×79十272×79
8.59+2.57+3.43+5.47             
49.62+27.17-19.62         
1546-(546-239)
分析:(1)應(yīng)用乘法分配律簡(jiǎn)算;
(2)應(yīng)用乘法結(jié)合律簡(jiǎn)算;
(3)應(yīng)用乘法分配律簡(jiǎn)算;
(4)應(yīng)用加法結(jié)合律簡(jiǎn)算;
(5)應(yīng)用加法交換律簡(jiǎn)算;
(6)應(yīng)用減法的簡(jiǎn)便運(yùn)算來解決問題.
解答:解:(1)301×79,
=(300+1)×79,
=300×79+1×79,
=23700+79,
=23779;
(2)125×72×4,
=(125×4)×72,
=500×72,
=36000;
(3)728×79十272×79,
=79×(728+272),
=79×1000,
=79000;
(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.
點(diǎn)評(píng):此題考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,認(rèn)真觀察,找出規(guī)律是解決此題的.
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