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How To Insert A NULL Value

When I insert a double quote ("") into a cell as a Null value this causes problems when creating formulas that use the cell.

I've searched many posts to do with Null values but can only find information on checking for a Null value, like ISBLANK().

But, I've not been able to find any information on how to write a formula like
=IF(ISBLANK(A1), "",A1/B1)
and substitute the double quote ("") with a value that is Truly Null?

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