1.9+39.9+19.9+199.9+0.4巧算求答!

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/07/13 13:40:18

1.9+39.9+19.9+199.9+0.4巧算求答!
快!

1.9+39.9+19.9+199.9+(0.1+0.1+0.1+0.1)
=(1.9+0.1)+(39.9+0.1)+(19.9+0.1)+(199.9+0.1)
=2+40+20+200
=262

1.9+39.9+19.9+199.9+0.4巧算求答! 1.9+19.9+199.9+1999.9+0.4 简便计算1.9+19.9+199.9-0.4 简便运算:1.9+19.9+199.9+1999.9+0.4= 1.9+19.9+199.9+1999.9简算 1.9+19.9+199.9+0.3解算 1.9+19.9+199.9+1999.9+19999.9 1999+199.9+19.9+1.9= 0.9 1.9 19.9 199.9用简算怎么算? 1.9+19.9+199.9+0.3怎样简算 1.9+19.9+199.9+1999.9+19999.9=? 1.9+19.9+199.9+0.3 如何简便运算