问题
解答题
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答案
(1)18×25×40,
=18×(25×40),
=18×1000,
=18000;
(2)103×42,
=(100+3)×42,
=4200+126,
=4326;
(3)125×72,
=125×8×9,
=(125×8)×9,
=1000×9,
=9000.
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(1)18×25×40,
=18×(25×40),
=18×1000,
=18000;
(2)103×42,
=(100+3)×42,
=4200+126,
=4326;
(3)125×72,
=125×8×9,
=(125×8)×9,
=1000×9,
=9000.