Remove the green triangle in the upper left corner of Excel

2 values are inherently equal, but because one is a numeric type and the other is a string type,
Cause, using if (A=b, "match", "not match") results in a not match. The following modification is match.

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Select all data regions from the beginning of the upper-left area with the start of a small triangle.
Then move the mouse to the first cell with a small triangle, there will be an exclamation mark, there is a conversion to a number.
That's it.

Remove the green triangle in the upper left corner of Excel