2999+999/999用简便方法计算
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2999+999/999用简便方法计算
2999+999/999用简便方法计算
2999+999/999用简便方法计算
2999+999/999
=2999+1
=3000
2999+999/999用简便方法计算
2999+999/999用简便方法计算
2999+999/999用简便方法计算
2999+999/999
=2999+1
=3000