999999999+999999999-999999999*999999999/999999999
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999999999+999999999-999999999*999999999/999999999999999999+999999999-999999999*999999999/99999999999
999999999+999999999-999999999*999999999/999999999
999999999+999999999-999999999*999999999/999999999
999999999+999999999-999999999*999999999/999999999
原式=999999999+999999999-999999999×1
=999999999+999999999-999999999
=999999999
题目： 999999999+999999999-999999999*999999999/999999999
=999999999+999999999-999999999x（999999999÷999999999）
=999999999+999999999-999999999x1
...
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题目： 999999999+999999999-999999999*999999999/999999999
=999999999+999999999-999999999x（999999999÷999999999）
=999999999+999999999-999999999x1
=999999999+999999999-999999999
=999999999+（999999999-999999999）
=999999999+0
=999999999
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