〔1/3)*(1/3)+(2/30)*(2/30)+(3/300)*(3/300)+(4/3000)*(4/3000)

问题描述:

〔1/3)*(1/3)+(2/30)*(2/30)+(3/300)*(3/300)+(4/3000)*(4/3000)

通分啊
(1000/3000)*(1000/3000)+(200/3000)*(200/3000)+(30/3000)*(30/3000)+(4/3000)*(4/3000)
=(1000000+40000+900+16)/9000000
=1040916/9000000
=212/1833
=0.1157