Question

19999.9+1999.9+199.9+19.9+1.9怎么用简便方法计算？

Answer 1

19999.9+1999.9+199.9+19.9+1.9怎么用简便方法计算？

19999.9+1999.9+199.9+19.9+1.9
=（20000-0.1）+（2000-0.1）+（200-0.1）+（20-0.1）+（2-0.1）
=22222-0.1×5
=22221.5

19999.9+1999.9+199.9+19.9+1.9的简便运算

19999.9+1999.9+199.9+19.9+1.9
=20000+2000+200+20+2 - 0.1x5
=22222 - 0.5
=22221.5

1.9+19.9+199.9+1999.9+19999.9用简便方法算

1.9+19.9+199.9+1999.9+19999.9
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5

19999.9+1999.9+199.9+19.9+1.9怎么巧算

19999.9+1999.9+199.9+19.9+1.9
=20000+2000+200+20+2-0.5
=22221.5

1.9+19.9+199.9+1999.9+19999.9+0.5这道题用简便方法怎么算

1.9+19.9+199.9+1999.9+19999.9+0.5
=1.9+19.9+199.9+1999.9+19999.9+0.1+0.1+0.1+0.1+0.1
=(1.9+0.1)+(19.9+0.1)+(199.9+0.1)+(1999.9+0.1)+(19999.9+0.1)
=2+20+200+2000+20000
=22222

9+19.9+199.9+1999.9+19999.9 的简便计算

9+19.9+199.9+1999.9+19999.9
=10-1+20-0.1+200-0.1+2000-0.1+20000-0.1
=10+20+200+2000+20000-1-0.1-0.1-0.1-0.1
=22230-1.4
=22228.6

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
=（20000+2000+200+20+2）-0.5
=22222-0.5
=22221.5
不畏前行，你也可以拥有一颗勇敢的心，抵抗一切困难！加油！

0.9+1.9+19.9+199.9【用简便方法计算】

0.9+1.9+19.9+199.9
= (1-0.1)+(2-0.1)+(20-0.1)+(200-0.1)
=1+2+20+200 - 0.4
= 2221-0.4
=2220.6

【秋风燕燕为您答题 O(∩_∩)O ，肯定对】
有什么不明白可以对该题继续追问
如果满意，请及时选为满意答案，谢谢

1.9+19.9+199.9+1999.9+19999.9=?

1.9+19.9+199.9+1999.9+19999.9
=（2-0.1）＋（20-0.1）＋（200-0.1）＋（2000－0.1）＋（20000－0.1）
=（2+20+200+2000+20000）-0.1*5
=22222-0.5
=22221.5

1.9+19.9+199.9+1999.9+19999.9+1 (巧算)

1.9+19.9+199.9+1999.9+19999.9+1 =(1.9+0.1)+(19.9+0.1)+(199.9+0.1)+(1999.9+0.1)+(19999.9+0.1)+(1-0.5) =2+20+200+2000+20000+0.5 =22222.5