How many of the five numbers are of the same kind?

A and B
Negative 1 / 7 π Mn and 5MN [yes]
12ax and 12by
X & # 178; y and negative 1 / 3YX & # 178; [yes]
1 and negative 1 [yes]
So there are four

Merge congeners: M & # 178; + (- Mn) - N & # 178; + (- M & # 178;) - (- 0.5N & # 178;)

Original formula = M & # 178; - Mn-N & # 178; - M & # 178; + 0.5N & # 178;
= -mn-0.5n²
Please point out that I hope to discuss it with you~
If you think my answer is good, please accept it in time,

Given a & # 178; - A-4 = 0, find the value of a & # 178; - 2 (A & # 178; - A + 3) - & # 189; (A & # 178; - A-4) - A

a²-2﹙a²-a+3﹚-½﹙a²-a-4﹚-a
=a²-2(a²-a-4+7)-0-a
=a²-2(0+7)-a
=a²-a-4-10
=-10；

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