用简便方法计算下面各题.
3.8×6.7+3.3×3.8?????????????1.28×0.29-0.29×0.28101×4.8???????????????????????56×12.5.
用简便方法计算下面各题.3.8×6.7+3.3×3.8?????????????1.28×0.29-0.29×0.28101×4.8?????????????????
答案:2 悬赏:10 手机版
解决时间 2021-01-03 16:08
- 提问者网友:我是我
- 2021-01-02 18:18
最佳答案
- 五星知识达人网友:归鹤鸣
- 2021-01-02 18:28
解:(1)3.8×6.7+3.3×3.8,
=3.8×(6.7+3.3),
=3.8×10,
=38;
(2)1.28×0.29-0.29×0.28,
=0.29×(1.28-0.28),
=0.29×1,
=0.29;
(3)101×4.8,
=(100+1)×4.8,
=100×4.8+1×4.8,
=480+4.8,
=484.8;
(4)56×12.5,
=7×(8×12.5),
=7×100,
=700.解析分析:(1)(2)(3)运用乘法分配律解答,
(4)化56=7×8,再运用乘法结合律解答.点评:本题主要考查学生运用简便算法解决问题的能力.
=3.8×(6.7+3.3),
=3.8×10,
=38;
(2)1.28×0.29-0.29×0.28,
=0.29×(1.28-0.28),
=0.29×1,
=0.29;
(3)101×4.8,
=(100+1)×4.8,
=100×4.8+1×4.8,
=480+4.8,
=484.8;
(4)56×12.5,
=7×(8×12.5),
=7×100,
=700.解析分析:(1)(2)(3)运用乘法分配律解答,
(4)化56=7×8,再运用乘法结合律解答.点评:本题主要考查学生运用简便算法解决问题的能力.
全部回答
- 1楼网友:十鸦
- 2021-01-02 19:13
对的,就是这个意思
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