1.9+19.9+199.9+1999.9+0.4
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+1999.9+19999.9
简便运算:1.9+19.9+199.9+1999.9+0.4=
1.9+19.9+199.9+1999.9+19999.9=?
19999.9+1999.9+199.9+19.9+1.9怎么巧算'急啊
19999.9+1999.9+199.9+19.9+1.9怎么巧算
要求简算``1.9+19.9+199.9+1999.9+0.
计算:1999.9+199.9+19.9+1.9=______.
简便计算1.9+19.9+199.9-0.4
1.9+39.9+19.9+199.9+0.4巧算求答!
1.9+19.9+199.9+0.3解算