解:①25×0.32×1.25,
=25×0.4×0.8×1.25,
=(25×0.4)×(0.8×1.25),
=10×1,
=10;
②0.37×79+3.7×2.1,
=3.7×7.9+3.7×2.1,
=3.7×(7.9+2.1),
=3.7×10,
=37;
③2011÷2011
+
,
=2011÷
+
,
=2011×
+
,
=2001×
,
=
+
,
=1;
④
+
+
+
+
,
=1-
+
-
+
-
+
-
+
-
,
=1-
,
=
;
⑤(
-
)×12,
=
×12-
×12,
=7-6,
=1;
⑥1000+999×999,
=1000+999×(1000-1),
=1000+999×1000-999×1,
=1000+999000-999,
=1000000-999,
=999001.
分析:①先把0.32分解成0.4×0.8,再運用乘法結(jié)合律簡算;
②先根據(jù)積不變規(guī)律把0.37×79變成3.7×7.9,再運用乘法分配律簡算;
③先把帶分數(shù)化成假分數(shù),轉(zhuǎn)化過程運用乘法分配律,再根據(jù)除以一個數(shù)等于乘這個數(shù)的倒數(shù)計算除法,最后算加法;
④
=1-
,
=
-
…由此化簡求解;
⑤運用乘法分配律簡算;
⑥先把其中一個999分解成1000-1,再運用乘法分配律簡算.
點評:本題考查了稍復雜的簡便運算,注意分析式中數(shù)據(jù),運用合適的簡便方法計算.