102.5*0.103.5-100.5*105.5 简便计算
答案:1 悬赏:50 手机版
解决时间 2021-03-01 03:25
- 提问者网友：謫仙
- 2021-02-28 14:43
102.5*0.103.5-100.5*105.5 简便计算
最佳答案
- 五星知识达人网友：迷人又混蛋
- 2021-02-28 16:15
102.5*103.5-100.5*105.5
=(103-0.5)*(103+0.5)-(103-2.5)*(103+2.5)
=103²-0.5²-103²+2.5²
=-0.5²+2.5²
=-0.25+6.25
=6
=(103-0.5)*(103+0.5)-(103-2.5)*(103+2.5)
=103²-0.5²-103²+2.5²
=-0.5²+2.5²
=-0.25+6.25
=6
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