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230问答网 > 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用简便方法算

要过程哦

2025-03-30 15:50:53

推荐回答（5个）

回答1：

答案：
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+20000-0.5
=22222-0.5
=22221.5

回答2：

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

回答3：

简算方法计算如下：
1.9+19.9+199.9+1999.9+19999.9
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5

回答4：

正确答案

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+20000-0.5
=22222-0.5
=22221.5

回答5：

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

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