999999999+999999999-999999999*999999999/999999999
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解:题目: 999999999+999999999-999999999*999999999/999999999
=999999999+999999999-999999999x(999999999÷999999999)
=999999999+999999999-999999999x1
=999999999+999999999-999999999
=999999999+(999999999-999999999)
=999999999+0
=999999999
=999999999+999999999-999999999x(999999999÷999999999)
=999999999+999999999-999999999x1
=999999999+999999999-999999999
=999999999+(999999999-999999999)
=999999999+0
=999999999
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