题目内容
怎样简便就怎样算. 1.29×0.25×4 |
96×10.1 |
6.9÷1.25÷8 | 5.78×4.25+57.8×0.575 |
分析:(1)运用乘法结合律简算;
(2)把10.1看作10+0.1,运用乘法分配律简算;
(3)运用除法的性质简算;
(4)根据数字特点,把原式变为5.78×4.25+5.78×5.75,运用乘法分配律简算.
(2)把10.1看作10+0.1,运用乘法分配律简算;
(3)运用除法的性质简算;
(4)根据数字特点,把原式变为5.78×4.25+5.78×5.75,运用乘法分配律简算.
解答:解:(1)1.29×0.25×4,
=1.29×(0.25×4),
=1.29×1,
=1.29;
(2)96×10.1,
=96×(10+0.1),
=96×10+96×0.1,
=960+9.6,
=969.6;
(3)6.9÷1.25÷8,
=6.9÷(1.25×8),
=6.9÷10,
=0.69;
(4)5.78×4.25+57.8×0.575,
=5.78×4.25+5.78×5.75,
=5.78×(4.25+5.75),
=5.78×10,
=57.8.
=1.29×(0.25×4),
=1.29×1,
=1.29;
(2)96×10.1,
=96×(10+0.1),
=96×10+96×0.1,
=960+9.6,
=969.6;
(3)6.9÷1.25÷8,
=6.9÷(1.25×8),
=6.9÷10,
=0.69;
(4)5.78×4.25+57.8×0.575,
=5.78×4.25+5.78×5.75,
=5.78×(4.25+5.75),
=5.78×10,
=57.8.
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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