9+99+999+9999巧算

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9+99+999+9999巧算
9+99+999+9999巧算

9+99+999+9999巧算
9+99+999+9999
=(10-1)+(100-1)+(1000-1)+(10000-1)
=10000+1000+100+10-4
=11100+6
=11106

9+99+999+9999
=10-1+100-1+1000-1+10000-1
=10000+1000+100+10-4
=11110-4
=11106

9+99+999+9999
=10+100+1000+10000-4
=11110-4
=11106

10-1+100-1+1000-1+10000-1=11110-4=11106

你好：
9+99+999+9999
=10-1+100-1+1000-1+10000-1
=11110-4
=11106

9+99+999+9999巧算 9999+999+99+9 9999+999+99+9+6 巧算 999×99×9巧算, (-9)+(-99)+(-999)+(-9999) 9999+999+99+9 简算9+99+999+9999 9+99+999+9999+...99999999 9999+999+99+9+8 9+99+999+9999+9999+99999=? 9999+9999+9999+9999+9999+9999+9999+999+999+999+99+99+9+9+99+9+1+1+1+1+253+6965+85664 99*999+99巧算简算：9999+999+99+9=?）简算9999+999+99+9+4 9+99+999+9999简便算法? 9999+999+99+9 简便计算 9＋99＋999＋9999 9+99+999+9999+99999+999999=? 9+99+999+9999简便计算