222乘999加333乘334的简便方法.6+99+999+9999+99999+999999+9999999的简便方法

6+99+999+9999+99999+999999+9999999
=6+9×(11+111+1111+11111+111111+1111111)
=6+9×1 234 566
=6+11111094=11 111 100