98点6×98点6-98点5×98点七简便运算
答案:2 悬赏:70 手机版
解决时间 2021-04-04 10:32
- 提问者网友：雪舞兮
- 2021-04-03 14:40
98点6×98点6-98点5×98点七简便运算
最佳答案
- 五星知识达人网友：怙棘
- 2021-04-03 14:57
98点6×98点6-98点5×98点七
=98.6*98.6-98.5*98
=98.6*98.6-98.6*98+0.1*98
=98.6*【98.6-98】+9.8
=98.6*0.6+9.8
=100*0.6-1.4*0.6+9.8
=60+9.8-0.84
=69-0.04
=68.96
满意采纳
=98.6*98.6-98.5*98
=98.6*98.6-98.6*98+0.1*98
=98.6*【98.6-98】+9.8
=98.6*0.6+9.8
=100*0.6-1.4*0.6+9.8
=60+9.8-0.84
=69-0.04
=68.96
满意采纳
全部回答
- 1楼网友：神的生死簿
- 2021-04-03 15:24
98.6^2-98.5*98.7
=98.6^2-(98.6-0.1)(98.6+0.1)
=98.6^2-(98.6^2-0.1^2)
=98.6^2-98.6^2+0.01
=0.01
=98.6^2-(98.6-0.1)(98.6+0.1)
=98.6^2-(98.6^2-0.1^2)
=98.6^2-98.6^2+0.01
=0.01
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