题目内容
用简便方法计算.
4.37×6.3+4.37×3.7 | 2.64÷1.25÷0.8 | 10.2×0.45. |
分析:算式①根据乘法分配律变为4.37×(6.3+3.7)进行计算;
算式②根据除法的性质计算;
算式③可据乘法分配律进行计算.
算式②根据除法的性质计算;
算式③可据乘法分配律进行计算.
解答:解:①4.37×6.3+4.37×3.7,
=4.37×(6.3+3.7),
=4.37×10,
=43.7;
②2.64÷1.25÷0.8,
=2.64÷(1.25×0.8),
=2.64÷1,
=2.64;
③10.2×0.45,
=(10+2)×0.45,
=10×0.45+2×0.45,
=4.5+0.9,
=5.4.
=4.37×(6.3+3.7),
=4.37×10,
=43.7;
②2.64÷1.25÷0.8,
=2.64÷(1.25×0.8),
=2.64÷1,
=2.64;
③10.2×0.45,
=(10+2)×0.45,
=10×0.45+2×0.45,
=4.5+0.9,
=5.4.
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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