41.2×8.1+21×1.25+53.7×1.9怎么简便？
答案:2 悬赏:50 手机版
解决时间 2021-01-17 04:56
- 提问者网友：你独家记忆
- 2021-01-16 22:54
41.2×8.1+21×1.25+53.7×1.9怎么简便？
最佳答案
- 五星知识达人网友：渊鱼
- 2021-01-16 23:48
41.2×8.1+21×1.25+53.7×1.9
=41.2×(10-1.9)+53.7×1.9+21×1.25
=412+1.9×(53.7-41.2)+21×1.25
=412+(19+21)×1.25
=412+40×1.25
=412+50
=462
=41.2×(10-1.9)+53.7×1.9+21×1.25
=412+1.9×(53.7-41.2)+21×1.25
=412+(19+21)×1.25
=412+40×1.25
=412+50
=462
全部回答
- 1楼网友：廢物販賣機
- 2021-01-17 00:01
41.2×8.1+21×1.25+53.7×1.9
=41.2×(10-1.9)+53.7×1.9+21×1.25
=412-41.2X1.9+53.7×1.9+21×1.25
=412+1.9×(53.7-41.2)+21×1.25
=412+1.9×12.5+21×1.25
=412+(19+21)×1.25
=412+40×1.25
=412+50
=462
=41.2×(10-1.9)+53.7×1.9+21×1.25
=412-41.2X1.9+53.7×1.9+21×1.25
=412+1.9×(53.7-41.2)+21×1.25
=412+1.9×12.5+21×1.25
=412+(19+21)×1.25
=412+40×1.25
=412+50
=462
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