From 1 to 9, 9 numbers in order, add a plus sign into the formula, each question is equal to 99, see how many you can add

Can you be more specific about the title?
It's 1 2 3 4 5 6 7 8 9 = 99
Is the middle the basic operation of addition, subtraction, multiplication and division?
Do you have any parentheses~
The goal is to make multiple equations of this kind

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