①25.74-2.36-7.64                               ②0.75×0.25×4
③8.4÷0.25÷4                                  ④2.8×3.6+1.4×2.8.
分析:①根據(jù)連續(xù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和簡(jiǎn)算;
②運(yùn)用乘法結(jié)合律簡(jiǎn)算;
③根據(jù)連續(xù)除以?xún)蓚(gè)數(shù)等于除以這兩個(gè)數(shù)的積簡(jiǎn)算;
④運(yùn)用乘法分配律簡(jiǎn)算.
解答:解:①25.74-2.36-7.64,
=25.74-(2.36+7.64),
=25.74-10,
=15.74;

②0.75×0.25×4,
=0.75×(0.25×4),
=0.75×1,
=0.75;

③8.4÷0.25÷4,
=8.4÷(0.25×4),
=8.4÷1,
=8.4;

④2.8×3.6+1.4×2.8,
=2.8×(3.6+1.4),
=2.8×5,
=14.
點(diǎn)評(píng):此題是考查四則混合運(yùn)算,要仔細(xì)觀(guān)察算式的特點(diǎn),靈活運(yùn)用一些定律進(jìn)行簡(jiǎn)便計(jì)算.
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