问题 解答题

利用你发现的规律,计算下列各题.

20×18×50

(45×25)×2×4

38×125×8×3

79×5×20.

答案

(1)20×18×50

=20×50×18,

=1000×18,

=18000;

(2)(45×25)×2×4

=45×2×(25×4),

=90×100,

=9000;

(3)38×125×8×3

=38×3×(125×8),

=114×1000,

=114000;

(4)79×5×20

=79×(5×20),

=79×100,

=7900.

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