用简便方法计算:0.9+0.99+0.999+0.9999+0.99999
问题描述:
用简便方法计算:0.9+0.99+0.999+0.9999+0.99999
答
0.9+0.99+0.999+0.9999+0.99999
=(1-0.1)+(1-0.01)+(1-0.001)+(1-0.0001)+(1-0.00001)
=5-0.11111
=4.88889