数列{an}中,a1=35,an+1-an=2n-1,求an

数列{an}中,a1=35,an+1-an=2n-1,求an
数列{an}中,a1=35,an+1-an=2n-1,求an

数列{an}中,a1=35,an+1-an=2n-1,求an

a1=35
a2-a1 =1
a3-a2=3
a4-a3=5
a5-a4=7
a6-a5=9
a7-a6=11
an-an-1=2n-3 两边相加an=35+(1+3+5+7+9+11+...+2n-3)=35+(n-1)+(n-1)(n-2)=n2-2n+36