1.6×(2.25+10.5÷1.5)79÷0.25÷0.4 5.02-1.8+4.880.65×6.5-0.65×5.5
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解决时间 2021-01-04 14:41
- 提问者网友:溺爱和你
- 2021-01-03 15:58
1.6×(2.25+10.5÷1.5)79÷0.25÷0.4 5.02-1.8+4.880.65×6.5-0.65×5.5 0.5×99+0.5 0.25×2.8×4
最佳答案
- 五星知识达人网友:长青诗
- 2021-01-03 16:50
解:(1)1.6×(2.25+10.5÷1.5),
=1.6×(2.25+7),
=1.6×(9+0.25),
=1.6×9+1.6×0.25,
=14.4+0.4,
=14.8;
(2)79÷0.25÷0.4,
=79÷(0.25×0.4),
=79÷0.1,
=790;
(3)5.02-1.8+4.88,
=5.02+4.88-1.8,
=9.9-1.8,
=8.1;
(4)0.65×6.5-0.65×5.5,
=0.65×(6.5-5.5),
=0.65×1,
=0.65;
(5)0.5×99+0.5,
=0.5×(99+1),
=0.5×100,
=50;
(6)0.25×2.8×4,
=0.25×4×2.8,
=1×2.8,
=2.8.解析分析:(1)先算小括号里面的除法,再运用乘法分配律简算;
(2)根据除法的性质简算;
(3)运用加法交换律简算;
(4)(5)运用乘法分配律简算;
(6)运用乘法交换律简算.
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.
=1.6×(2.25+7),
=1.6×(9+0.25),
=1.6×9+1.6×0.25,
=14.4+0.4,
=14.8;
(2)79÷0.25÷0.4,
=79÷(0.25×0.4),
=79÷0.1,
=790;
(3)5.02-1.8+4.88,
=5.02+4.88-1.8,
=9.9-1.8,
=8.1;
(4)0.65×6.5-0.65×5.5,
=0.65×(6.5-5.5),
=0.65×1,
=0.65;
(5)0.5×99+0.5,
=0.5×(99+1),
=0.5×100,
=50;
(6)0.25×2.8×4,
=0.25×4×2.8,
=1×2.8,
=2.8.解析分析:(1)先算小括号里面的除法,再运用乘法分配律简算;
(2)根据除法的性质简算;
(3)运用加法交换律简算;
(4)(5)运用乘法分配律简算;
(6)运用乘法交换律简算.
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.
全部回答
- 1楼网友:洒脱疯子
- 2021-01-03 17:12
我好好复习下
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