(306+603)*99/9999
1个回答
原式：909*99/9999
=（101*90)*(11*9)/(1111*9)
=101*9*11*9/(101*11)*9
=9
相关问题
9+99+999+9999+9999+99999=?
99+999+9999+99999＝
简便运算：603乘99加603 九分之七乘38乘七分之九
√9×9＋19；√99×99＋199； √999×999＋1999 √9999×9999＋19999；
9+99+999+9999+99999=?
9+99+999+9999+99999 = =
99×999×9999..
9+99+999+9999+99999+999999=______．
9+99+999+9999+99999+999999=______．
9+99+999+9999+99999+999999=______．