6.7x23 0.67x7.7简便方法算
答案:1 悬赏:10 手机版
解决时间 2021-11-26 00:40
- 提问者网友：练爱
- 2021-11-25 08:38
6.7x23 0.67x7.7简便方法算
最佳答案
- 五星知识达人网友：孤独的牧羊人
- 2021-11-25 09:04
6.7x23
=(7-0.3)x23
=7x23-0.3x23
=161-6.9
=154.1
0.67x7.7
=(0.7-0.03)x(7+0.7)
=0.1x(7-0.3)x(7+0.7)
=0.1x(7x7+0.4x7-0.3x0.7)
=0.1x(49+2.8-0.21)
=5.159
=(7-0.3)x23
=7x23-0.3x23
=161-6.9
=154.1
0.67x7.7
=(0.7-0.03)x(7+0.7)
=0.1x(7-0.3)x(7+0.7)
=0.1x(7x7+0.4x7-0.3x0.7)
=0.1x(49+2.8-0.21)
=5.159
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