简便运算:9/10+99/100+999/1000+9999/10000+0.1111

问题描述:

简便运算:9/10+99/100+999/1000+9999/10000+0.1111

9/10+99/100+999/1000+9999/10000+0.1111 =9/10+99/100+999/1000+9999/10000+1111/10000 =9/10+99/100+999/1000+9999/10000+1/10000+10/10000+100/10000+1000/10000 =(9/10+1000/10000)...