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9.9+99.9+999.9+9999.9巧算怎么算

9.9+99.9+999.9+9999.9 =(10-0.1)+(100-0.1)+(1000-0.1)+(10000-0.1) =10+100+1000+10000-0.1-0.1-0.1-0.1 =11110-0.4 =11109.6

0.9+9.9+99.9+999.9+9999.9 =(0.9+0.1)+(9.9+0.1)+(99.9+0.1)+(999.9+0.1)+(9999.9 +0.1)-0.5 =1+10+100+1000+10000-0.5 =11111-0.5 =11110.5

11118.6

0.9+9.9+99.9+999.9+9999.9+99999.9+999999.9 =(1-0.1)+(10-0.1)+(100-0.1)+(1000-0.1)+(10000-0.1)+(100000-0.1)+(1000000-0.1) =1111111-0.7=111111.3 原理:分解原式加数,并灵活运用加法结合律。

11106

-188893

0.9+9.9+99.9+999.9+9999.9 =1+10+100+1000+10000-(0.1+0.01+0.001+0.0001) =11111-0.1111 =1 110.8889

无法正常回答

9.9+99.9+999.9+9999.9+99999.9 =(9.9+0.1)+(99.9+0.1)+(999.9+0.1)+(9999.9+0.1)+(99999.9+0.1)-0.1×5 =10+100+1000+10000+100000-0.5 =111110-0.5 =111109.5

(1-0.1)+(10-0.1)+(100-0.1)+(1000-0.1)+(10000-0.1)+(100000-0.1)+(1000000—0.1)=1111111-0.7=1111110.3

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