简便计算2.8×4.3 0.8×3.4 7.7×7.2
答案:1 悬赏:40 手机版
解决时间 2021-01-13 01:48
- 提问者网友：鼻尖触碰
- 2021-01-12 14:34
简便计算2.8×4.3 0.8×3.4 7.7×7.2
最佳答案
- 五星知识达人网友：英雄的欲望
- 2021-01-12 15:38
2.8X4.3
=3X4.3-0.2X4.3
=12.9-0.46
=12.44
0.8x3.4
=1x3.4-0.2x3.4
=3.4-0.68
=3.4-1+0.32
=2.72
7.7x7.2
=8x7.2-0.3x7.2
=57.6-2.16
=55.44
=3X4.3-0.2X4.3
=12.9-0.46
=12.44
0.8x3.4
=1x3.4-0.2x3.4
=3.4-0.68
=3.4-1+0.32
=2.72
7.7x7.2
=8x7.2-0.3x7.2
=57.6-2.16
=55.44
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