求和0.2+0.02+0.002+……=

问题描述:

求和0.2+0.02+0.002+……=
求和0.2+0.02+0.002+……=

0.2+0.02+0.002+……=
=lim(n->∞)0.2(1-1/10^n)/(1-0.1)
=0.2/(1-0.1)
=2/9