用简便方法计算25×32 &nbsp...

2020-09-21 社会 89阅读

(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.
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