2.1×9.8+0.42的简算
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解决时间 2021-02-01 00:22
- 提问者网友：容嬷嬷拿针来
- 2021-01-31 09:31
2.1×9.8+0.42的简算
最佳答案
- 五星知识达人网友：拾荒鲤
- 2021-01-31 10:21
2.1×9.8+0.42的简算
=2.1x9.8+2.1x0.2
=2.1x(9.8+0.2)
=2.1x10
=21
=2.1x9.8+2.1x0.2
=2.1x(9.8+0.2)
=2.1x10
=21
全部回答
- 1楼网友：逃夭
- 2021-01-31 12:50
2.1×9.8+0.42
2.1x9.8+2.1x0.2
=2.1x(9.8+0.2)
=2.1x10
=21
2.1x9.8+2.1x0.2
=2.1x(9.8+0.2)
=2.1x10
=21
- 2楼网友：荒野風
- 2021-01-31 12:34
0.42是2.1的0.2倍 所以直接2.1X9.8+2.1X0.2 = 2.1X10 =21
- 3楼网友：由着我着迷
- 2021-01-31 12:01
2.1×9.8+0.42的简算
解：采用分配律，
原式=2.1×9.8+0.42
=2.1x（10-0.2）+0.42
=2.1x10-2.1x0.2+0.42
=21-0.42+0.42
=21+0
=21
解：采用分配律，
原式=2.1×9.8+0.42
=2.1x（10-0.2）+0.42
=2.1x10-2.1x0.2+0.42
=21-0.42+0.42
=21+0
=21
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