9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?
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![9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?](/uploads/image/z/120477-21-7.jpg?t=9%2B99%2B999%2B9999%2B99999%2B999999%2B9999999%2B99999999%2B999999999%2B9999999999%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%2C%E6%9C%89%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E5%90%97%3F)
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?
在每项上加1,就是简便算法,总共加10个1,最后再减去10,就好了