9×9+99×99+999×999+9999×9999+9999+999+99+9=?等于多少?
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9×9+99×99+999×999+9999×9999+9999+999+99+9=?等于多少?9×9+99×99+999×999+9999×9999+9999+999+99+9=?等于多少?9×9+
9×9+99×99+999×999+9999×9999+9999+999+99+9=?等于多少?
9×9+99×99+999×999+9999×9999+9999+999+99+9=?等于多少?
9×9+99×99+999×999+9999×9999+9999+999+99+9=?等于多少?
=(9*9+9)+(99*99+9)+(999*999+999)+(9999*9999+9999)
=9*(9+1)+99*(99+1)+999*(999+1)+9999*(9999+1)
=90+9900+999000+99990000
=100998990
9+99+999+9999
9×9+99×99+999×999+9999×9999+9999+999+99+9=?等于多少?
9999999999+999999999+99999999+99999+9999+999+99+9=?
用乘法分配律简便法计算:9+99+99+999+4
99+999+9999+99999
99×99+199 999×999+1999 简算.
9999×999×99×9+1+11+111+1111=(
5×999+5×99×7+7+3×9+3+9用简便方法计箅
9+99+999+3简便运算 综合算式
121×100又1/121简便计算9999+999+99+9简便计算
99+99×99+999×999×999等于=?用简便方法计算,
巧算 (1)5×999+5+99×7+7+3×9+3 = = = = = (2)99999+巧算(1)5×999+5+99×7+7+3×9+3= ====(2)99999+9999+999+99+9+5======
999+99+9
999+99+9=?
(-9)+(-99)+(-999)+(-9999)
999×99×9巧算,
9999+999+99+9
999又9分之8+99又9分之8+9又9分之8+3分之1.(要简便计算,)