奇數(shù)項(xiàng)a1,a3,a5,.a99是公差為0的等差數(shù)列
偶數(shù)項(xiàng)a2,a4,a6,.a100是公差為2的等差數(shù)列
所以s100=a1+a3+.+a99+a2+a4+.+a100=50+50x2+2x50x(50-1)÷2=2600
8 在數(shù)列an中,a1=1,a2=2,且a第n+2項(xiàng)-an=1+(-1)的n次方,n屬于正整數(shù),S100為多少
8 在數(shù)列an中,a1=1,a2=2,且a第n+2項(xiàng)-an=1+(-1)的n次方,n屬于正整數(shù),S100為多少
數(shù)學(xué)人氣:559 ℃時(shí)間:2020-09-16 07:02:08
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