第一個(gè):1-(0.1)^n 即1減去0.1的n次方
第二個(gè):[1+(-1)^(1+n) ] /2 即負(fù)1的1+n次方與1的和再除以2
第三個(gè):(n+2)/(3n+2)
第四個(gè):(-1)^n*{[n(n+2)] / (2n+1)} 即負(fù)1的n次方與大括號(hào)中分?jǐn)?shù)相乘
0.9,0.99,0.999,0.9999,.
0.9,0.99,0.999,0.9999,.
1,0,1,0,1,0,.
3/5,1/2,5/11,3/7.
-1,8/5,-15/7,24/9...
1,0,1,0,1,0,.
3/5,1/2,5/11,3/7.
-1,8/5,-15/7,24/9...
數(shù)學(xué)人氣:798 ℃時(shí)間:2020-05-20 15:28:26
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