She has a math test paper and a calculation problem. There are addition, subtraction, multiplication, division and parentheses in it. I asked her what is disjunctive calculation. She said that the above-mentioned thing is disjunctive calculation, but I don't think it's appropriate. I can't give any reason. I can't find it in her math textbook. Excuse me, what is disjunctive calculation in primary school math?

For example: 1 + 1 + 5 * 5
=2+5*5
=2+25
=27
That is, according to the four algorithms, multi-step calculation, step by step an equal sign, until the final result

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