晶钢门隐形拉手效果图:求斐波那契数列的通式?
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1/2 1/6 1/12 1/20
1/(1*2),1/(2*3),1/(3*4),1/(4*5).....1/n(n+1)
1-1/2,1/2-1/3,1/3-1/4,1/4-1/5,......1/n-1/(n+1)
1/(1*2),1/(2*3),1/(3*4),1/(4*5).....1/n(n+1)
1-1/2,1/2-1/3,1/3-1/4,1/4-1/5,......1/n-1/(n+1)