已知数列{an}满足an+1=an+n,a1等于1,则an=?
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已知数列{an}满足an+1=an+n,a1等于1,则an=?已知数列{an}满足an+1=an+n,a1等于1,则an=?已知数列{an}满足an+1=an+n,a1等于1,则an=?A2=A1+1
已知数列{an}满足an+1=an+n,a1等于1,则an=?
已知数列{an}满足an+1=an+n,a1等于1,则an=?
已知数列{an}满足an+1=an+n,a1等于1,则an=?
A2=A1+1
A3=A2+2
A4=A3+3
.
An=A(n-1)+(N-1)
左式上下相加=右式上下相加
An=A1+[1+2+3+...+(N-1)]
An=1+[N(N-1)]/2
你应该是题目没写清楚吧
a(n+1)=an+n得出a(n+1)-an=n
则有,a2-a1=2,a3-a2=3,a4-a3=4……an-a(n-1)=n
所有式子相加得,an-a1=2+3+4+5+……+n,即an=a1+2+3+4+……+n=1+2+3+……+n=n(n+1)/2
是这个意思吗?
这题目是不是有问题啊?
an=n
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