精英家教网 > 小学数学 > 题目详情
25×24=25×4×20
×
×
.(判断对错)
分析:根据乘法分配律:一个数乘两个数的和,等于这个数分别乘这两个加数,然后把乘得的积相加解答.
解答:解:25×24,
=25×(4+20),
=25×4+25×20,
=100+500,
=600;
25×4×20=2000,
600≠2000;
故答案为:×.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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450-140= 25÷7= 900+238= 600-9×8=
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7
÷24=
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5
=
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5
÷
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