问题 解答题
用简便方法计算:(要写计算过程.)
①25×125×8×40②52×66+33×52+52③37×99④45×101.
答案

(1)25×125×8×40,

=(25×40)×(125×8),

=1000×1000,

=1000000;

(2)52×66+33×52+52,

=52×(66+33+1),

=52×100,

=5200;

(3)37×99,

=37×(100-1),

=37×100-37×1,

=3700-37,

=3663;

(4)45×101,

=45×(100+1),

=45×100+45×1,

=4500+45,

=4545;

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