用简便方法计算．①3.5%×9.9 ...
答案:1 悬赏:70 手机版
解决时间 2021-11-11 16:25
- 提问者网友：欲劫无渡
- 2021-11-11 09:27
用简便方法计算．①3.5%×9.9 ...
最佳答案
- 五星知识达人网友：冷風如刀
- 2021-11-11 10:02
①3.5%×9.9
=0.035×（10-0.1）
=0.035×10-0.035×1
=0.35-0.035
=0.315
②4.62+9.9
=4.62+10-0.1
=14.62-0.1
=14.52
③7.25×1.8+27.5×0.18
=7.25×1.8+2.75×1.8
=（7.25+2.75）×1.8
=10×1.8
=18
=0.035×（10-0.1）
=0.035×10-0.035×1
=0.35-0.035
=0.315
②4.62+9.9
=4.62+10-0.1
=14.62-0.1
=14.52
③7.25×1.8+27.5×0.18
=7.25×1.8+2.75×1.8
=（7.25+2.75）×1.8
=10×1.8
=18
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