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第一个:1-(0.1)^n 即1减去0.1的n次方
第二个:[1+(-1)^(1+n) ] /2 即负1的1+n次方与1的和再除以2
第三个:(n+2)/(3n+2)
第四个:(-1)^n*{[n(n+2)] / (2n+1)} 即负1的n次方与大括号中分数相乘
9*10的负N次方,N是自然数
(-1)的负(N+1)次方乘以1/2+1/2
(2n+1)/(3n+2)
0.9+0.99+0.999+0.9999
0.9+0.99+0.999+0.9999简算
0.9+0.99+0.999+.+0.999999999=
0.9+0.99+0.999+.0.999999999=?
0.9+0.99+0.999+.+0.999999999=?
简便运算:0.9+0.99+0.999+``+0.99```9
0.9+0.99+0.999怎么简算
0.9+0.99+0.999用简便方法计算
0.9+0.99+0.999+0.9999怎么简便计算
0.9+0.99+0.999+简便方法计算
用简便方法计算:0.9+0.99+0.999
0.9+0.99+0.999+0.9999简便计算
0.9+0.99+0.999+0.9999怎么巧算
9+0.9+0.99+0.999+0.9999简便计算
0.9,0.99,0.999.这类小数越来越接近
求:0.9 0.99 0.999 0.9999的和.
用简便方法计算:0.9+0.99+0.999+0.9999+0.99999
0.9999+0.999+0.99+0.9 该如何简算?