41.2*8.1＋11*1.25＋53.7*1.9 如何简便计算？（脱式）
答案:2 悬赏:80 手机版
解决时间 2021-03-08 06:59
- 提问者网友：爱唱彩虹
- 2021-03-07 07:05
*是乘号
最佳答案
- 五星知识达人网友：深街酒徒
- 2021-03-07 07:45
41.2*8.1+11*1.25+53.7*1.9
=41.2*8.1+53.7*(10-8.1)+11*1.25
=41.2*8.1+53.7*10-53.7*8.1+11*1.25
=53.7*10-(53.7-41.2)*8.1+11*1.25
=537-12.5*8.1+1.1*12.5
=537-12.5*(8.1-1.1)
=537-87.5
=449.5
=41.2*8.1+53.7*(10-8.1)+11*1.25
=41.2*8.1+53.7*10-53.7*8.1+11*1.25
=53.7*10-(53.7-41.2)*8.1+11*1.25
=537-12.5*8.1+1.1*12.5
=537-12.5*(8.1-1.1)
=537-87.5
=449.5
全部回答
- 1楼网友：动情书生
- 2021-03-07 08:05
41.2×8.1+11×1.25+53.7×1.9
=41.2x10-41.2x1.9+1.1x12.5+53.7x1.9
=412+1.9x(53.7-41.2)+1.1x12.5
=412+1.9x12.5+1.1x12.5
=412+12.5x(1.9+1.1)
=412+12.5x3
=412+37.5
=449.5
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