1.9+39.9+19.9+199.9+0.4巧算求答!快!
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1.9+39.9+19.9+199.9+0.4巧算求答!快!1.9+39.9+19.9+199.9+0.4巧算求答!快!1.9+39.9+19.9+199.9+0.4巧算求答!快!1.9+39.9+1
1.9+39.9+19.9+199.9+0.4巧算求答!快!
1.9+39.9+19.9+199.9+0.4巧算求答!
快!
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+199.9+1999.9+0.4=(2-0.1)+(40-0.1)+(200-0.1)+(2000-0.1)+0.4=2+40+200+2000=2242
1.9+39.9+19.9+199.9+0.4巧算求答!快!
1.9+19.9+199.9+1999.9简算
1.9+19.9+199.9+0.3解算
1999+199.9+19.9+1.9=
1.9+19.9+199.9+0.3怎样简算
0.9 1.9 19.9 199.9用简算怎么算?
1.9+19.9+199.9+0.3 如何简便运算
1999.9+199.9+19.9+1.9怎么简便运算
1.9+19.9+199.9+0.3怎样简
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=
0.9+1.9+19.9+199.9【用简便方法计算】
19999.9+1999.9+199.9+19.9+1.9怎么巧算
19999.9+1999.9+199.9+19.9+1.9怎么巧算'急啊
要求简算``1.9+19.9+199.9+1999.9+0.
1.9+19.9+199.9+1999.9+19999.9=?要过程是简便运算
1.9+19.9+199.9+1999.9+0.4一定要简便算法,有一定的计算过程
19.9+29.9+39.9+49.9 简便计算