问题
解答题
下面各题,如何简算就如何算.
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答案
(1)45×18,
=45×2×9,
=90×9,
=810;
(2)197+46+54,
=197+(46+54),
=197+100,
=297;
(3)13×25×4,
=13×(25×4),
=13×100,
=1300;
(4)630÷35,
=630÷(7×5),
=630÷7÷5,
=90÷5,
=18.
下面各题,如何简算就如何算.
|
(1)45×18,
=45×2×9,
=90×9,
=810;
(2)197+46+54,
=197+(46+54),
=197+100,
=297;
(3)13×25×4,
=13×(25×4),
=13×100,
=1300;
(4)630÷35,
=630÷(7×5),
=630÷7÷5,
=90÷5,
=18.