999999999*999999999用简便算法
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999999999*999999999用简便算法999999999*999999999用简便算法999999999*999999999用简便算法因为99*99=9801999*999=99800199
999999999*999999999用简便算法
999999999*999999999
用简便算法
999999999*999999999用简便算法
因为99*99=9801
999*999=998001
9999*9999=99980001
都是乘数9的个数-1个9加1个8加乘数9的个数-1个0加1个1
所以999999999*999999999=999999998000000001
999999999+999999999-999999999*999999999/999999999
999999999*999999999用简便算法
999999999减999999999加999999999除999999999
999999999×999999999÷999999999+1=
111111111*999999999
999999999+111111111
1+999999999
999999999+111111111=?
111111111十999999999
999999999-1=?
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