问题 解答题

用简便方法计算:

25×125×40×8

57×38+57×2

(20+8)×125

(163+198)+402

37×101

44×25.

答案

(1)25×125×40×8,

=(25×40)×(125×8),

=1000×1000,

=1000000;

(2)57×38+57×2,

=57×(38+2),

=57×40,

=2280;

(3)(20+8)×125,

=20×125+8×125,

=2500+1000,

=3500;

(4)(163+198)+402,

=163+(198+402),

=163+600,

=763;

(5)37×101,

=37×(100+1),

=37×100+37,

=3700+37,

=3737;

(6)44×25,

=11×4×25,

=11×(4×25),

=11×100,

=1100.

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