1.9+19.9+199.9+1999.9简算
1.9+19.9+199.9+1999.9简算
1.9+19.9+199.9+1999.9+19999.9
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
简便运算:1.9+19.9+199.9+1999.9+0.4=
要求简算``1.9+19.9+199.9+1999.9+0.
计算:1999.9+199.9+19.9+1.9=______.
1.9+19.9+199.9+0.3解算
1999+199.9+19.9+1.9=
9+19.9+199.9+1999.9+19999.9 的简便计算