0.1+0.4+0.7+0.10+0.13+0.16+0.19+…+1.00用等差数列计算.

问题描述:

0.1+0.4+0.7+0.10+0.13+0.16+0.19+…+1.00用等差数列计算.

等差数列求和公式为Sn=[n(A1+An)]/2或者Sn=nA1+[n(n-1)d]/2 .
A1=0.01;d=0.03;n=34.
故原式=34*0.01+34*33*0.03/2
=17.17