题目内容

简便计算
0.389×4×0.25     
10.1×7.8     
6.37×3.02+6.98×6.37.

解:(1)0.389×4×0.25,
=0.389×(4×0.25),
=0.389×1,
=0.389;

(2)10.1×7.8,
=(10+0.1)×7.8,
=10×7.8+0.1×7.8,
=78+0.78,
=78.78;

(3)6.37×3.02+6.98×6.37,
=6.37×(3.02+6.98),
=6.37×10,
=63.7.
分析:(1)运用乘法结合律解答,
(2)化10.1=10+0.1,再运用乘法分配律解答,
(3)运用乘法分配律解答.
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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