解:
(1)25×32,
=25×4×8,
=100×8,
=800;
(2)475+57+43,
=475+(57+43),
=475+100,
=575;
(3)25×(6×4),
=(25×4)×6,
=100×6,
=600;
(4)125×16,
=125×8×2,
=1000×2,
=2000;
(5)175+201,
=175+200+1,
=375+1,
=376;
(6)451-51-49,
=451-(51+49),
=451-100,
=351.
分析:(1)把32拆成4×8,然后把25和4得用乘法的结合律;
(2)利用加法的结合律,先算57+43;
(3)利用乘法的结合律,把25和4结合;
(4)先把16拆成8×2,然后利用乘法的结合律,125和8结合;
(5)把201拆成200+1,然后再计算;
(6)利用连续减去两个数等于减去这两个数的和.
点评:此题考查了加法和乘法的结合律等简便方法的应用.