等差数列:76+77+78+79+80+.+956+957=
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![等差数列:76+77+78+79+80+.+956+957=](/uploads/image/z/135866-2-6.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BC%9A76%2B77%2B78%2B79%2B80%2B.%2B956%2B957%3D)
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等差数列:76+77+78+79+80+.+956+957=
等差数列:76+77+78+79+80+.+956+957=
等差数列:76+77+78+79+80+.+956+957=
76+77+78+79+80+.+956+957
=(76+957)×(957-76+1)÷2
=455553
自己算
(957-75)*(957+76)/2
=882*1033/2
=455553
424563
n=957-76+1=882
(76+957)*882/2
=1033*441
=455553
(a1+an)*n/2
a1=76(最小值)
an=957(最大值)
n=882(个数)
result=45553
等差数列的求和公式为:n*a1+n*(n-1)*d/2
在本题中 n=957-76+1=882;a1=76;d=1
所以结果为:455553